It's a cliche, but it's a cliche because it works. Often you'll find that you've held your breath when reacting, or have begun breathing erratically. Take several slow deep breaths using your diaphragm and abdominal muscles when presented with difficult situations. Procrastination has not been shown to be an effective coping method, and neither has straight-up ignoring the issue. Think about how to handle yourself here and now. Often, the issues that work us up are small ones, piled up high enough to feel huge and important when they aren't. Every problem or stressor can always be broken down into components you can handle; if it doesn't seem like it can, that's only because it hasn't been broken down far enough yet! Releasing a little steam can sometimes keep from the whole kettle boiling over, so to speak. Overcoming oversensitivity doesn't mean you have to be meek or unfeeling. Sometimes it means you need to talk it out when it's still comfortable to talk about, before you have time to ruminate on an offhand comment and become overcome or despondent. Over a long enough time, dealing with the same distressing or aggravating issue can make it so that the smallest version of it elicits a huge and seemingly disproportionate response. Don't let the small things gnaw away at you. Bring them out into the open so they don't build up. You may feel yourself go numb and quiet as a balm to deal in an uncomfortable social situation, but don't let yourself be defeated. Try and take a quiet moment to see the situation as it really is. You're probably not debating nuclear disarmament deals before the U.N. You're in a passing, emotionally stressful moment. Physically excuse yourself from the situation as easily as you can. It may prove more appropriate to slip away unnoticed, but if you're in conversation at a social event let someone know you're going to step away for a moment; this token gesture of normalcy can help stabilize your perception of the situation, especially if this was a situation in which you felt embarrassed or vulnerable. "Getting some fresh air" or "going to the bathroom" are both time-tested excuses. Considering the ubiquity of smartphones, you won't even need anything beyond a gesture toward an iPhone screen to indicate why you need to step away. It's not about embracing unpleasant feelings, but about accepting how small of a moment that feeling was, and that you're moving past it; you'll move past it every time, because there's no other option.
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One-sentence summary -- Take a deep breath. Stay in the present. Express yourself. Hang in there. Distance yourself, literally. Accept that working on it is progress in and of itself.

Even if you're pretending to everyone else, have one person you can talk to about how you really feel. It might a trusted friend or family member, or maybe a counselor. Sometimes it is better to stop pretending you're happy and start letting out some of your sadness or anger to someone you trust. Letting your feelings stay bottled up will cause you to feel more unhappy and can harm your overall health in the long run. Maybe you can't express your feelings while you're at school or with other people, but make sure you find a way to acknowledge and express your emotions. Don't hold your emotions in. Look inside yourself and try to name the feelings you feel. Then, find an outlet to help you express it. Write in a journal, write song lyrics, listen to music, dance, paint, or draw. Whatever you do, it should help you work through your feelings and express them in a meaningful way. If you feel like you have to pretend to be happy in order to manage your sadness or you hate to be a "buzzkill," it might be time to consider treatment for depression. Notice if you have symptoms of depression and talk them over with a professional. They can help you manage your symptoms, prevent future episodes, and provide a place for you to share your honest feelings. Find a therapist by contacting your insurance provider or a local mental health clinic. You can also get a recommendation from a family member or friend.
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One-sentence summary -- Talk to someone you trust about how you feel. Express how you feel in some way. See a therapist if you feel depressed.

Slide the clamps closed and push the extension rod in all the way. Then, hit reset to display only zeros on the screen. Properly zeroed calipers are essential to getting an accurate measurement, so make sure to do this! Calipers have 2 large jaws that you can open and close around the outside of an object. These jaws are located at the bottom of the ruler part of the calipers. Open the calipers so they are wider than the outside of the object, and then close the calipers around the part of the object you want to measure. For example, to measure the length of a nail, open the calipers wider than the length of the nail and close them so that 1 jaw is touching the head of the screw and the other is against the pointed end of the screw. Find the inner measurement jaws on top of the calipers (above the part that looks like a ruler). These are smaller than the outer jaws. Close the inner jaws of the calipers and put them inside of the object. Open the calipers so the inner jaws are pressed against the inside of the object. For example, to measure the inner diameter of a pipe, open the calipers until they are pressed against the inside of the pipe to get your measurement. Locate the extension rod on the side (or end of the ruler section) of the calipers. Position the calipers against the top edge of the object or hole, and then extend the bar down into the hole or object until it touches the bottom. For example, to measure the depth of a hole, place the caliper jaws against the rim of the hole and extend the bar down into the hole all the way to the bottom. Look at the screen and record the number. Keep in mind that the readout will include a zero or whole number followed by a decimal and 3 digits behind it. For example, the readout may say 0.365in (0.93cm) or 4.987in (12.67cm). Record the entire number as your measurement. Some digital calipers have a button to change the measurement from imperial to metric or vice versa. Check to see if this is a feature of your calipers and press the button if needed.
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One-sentence summary --
Zero out the calipers before you get started. Clamp the jaws around the outside of the object for an external measurement. Open the jaws inside of an object to find the inner diameter. Push the extension rod into the object for a depth measurement. Look at the digital reading.