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How to calm your nerves around the guy you like
Breathe!
When you feel your heart thudding faster and faster, pay attention to how you are breathing. Remember: the quicker you breathe, the less air your lungs get. That means your heart is speeding up to pump the little oxygen you have to the rest of your body.
So make a point of taking deep breaths to calm your body and mind. Breathe in through your nose and out through your mouth.