If you decide to do something because you want to do it, you'll be able to stay a lot more carefree about the task itself. If you feel like you're forced into your job, or that you're forced to have to go to the gym, those things will become chores. If you treat them as opportunities, they'll be fun. Make the choice to do them. Changing your attitude doesn't have to be complicated, or require a lot of complex psychology. If you want to do something, do it. If you don't, find a way to make it work for you, or cut it from your life. Sometimes it's that simple. Hate your job? Quit and get another one. Sick of the town you live in? Move. If something isn't supporting you or helping you live a happy, carefree life, make a change. It may sound silly, but you will feel so much happier when you smile widely at a friend or a random stranger and they smile back. You will feel a lot lighter if you laugh as well. Laugh at whatever you find funny, even if the people around you don't see the humor. Being carefree doesn't mean you should be a laughing fool. Taking a funeral or a memorial service lightly isn't appropriate. It's still important to stay tactful. Just look out the window and you'll likely see something ridiculous. You're a human who lives in a little box plugged into a computer box. Someone walking dogs around the neighborhood and picking up their poop and carrying it with them. How weird! Try to remember that life should be something to laugh at, and something to appreciate. It's not something to endure. Don't get stuck on the small details. Instead, focus on the big picture and consider what is really important when you put it into context. Worrying about your past mistakes will leave you stressed. Instead, embrace the potential of your life. Who cares if people don't like the you? You can change over time and become a new person or find new friends. You could move to another country and within 10 years you would have new friends and think in a new language, you would be a new person. Anything can happen.
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One-sentence summary -- Do things because you want to do them. Make yourself smile and laugh regularly. Take things less seriously. Think about the future, don't focus on the past.

The Big Dipper is comprised of seven of the sky's brightest stars, and is found either high or low in the northern sky, depending on the season. It also rotates around the North Star, which is why it's important when you're trying to find your direction in the Northern Hemisphere. As long as you're located no lower than about 39 degrees north latitude (the latitude of Washington, DC), the constellation is always above the horizon. (You can see the Big Dipper at a lower latitude if you're on the ocean.) Four of the stars form the Big Dipper's bowl, while the other three form a handle. The phrase "spring up and fall down" can help you figure out where to look in the sky for the Big Dipper based on the seasons. In the spring and summer, it's located high in the sky. On fall and winter nights, you'll find it lower in the sky, closer to the horizon. Regardless of the season, the two stars that form the outer edge of the Big Dipper's bowl always point toward the North Star. If you draw an imaginary line from the pointer stars across the sky to the next brightest star, you'll find the North Star. If you're having trouble finding the North Star, stretch your arm out completely and spread your fingers. The distance between the top pointer star and the North Star should be about the same distance as your thumb is from your middle finger. Unlike the stars in the Big Dipper constellation, the North Star is always located at fixed point in the sky, which leaves it never more than 1 degree from true north. That means when you've identified the North Star in the sky, you know that you're facing north. From that position, the opposite direction would be south, while east would be to your right and west would be to the left. Using the North Star to find your direction works best on a clear night. If the sky is hazy or there are clouds, you may not be able to easily identify the Big Dipper. If you're in an area where mountains, trees, or other objects are blocking the night sky, you may not be able to use the North Star to find your direction either.
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One-sentence summary --
Identify the Big Dipper. Use the pointer stars to find the North Star. Locate north.