If your age bracket is correct, you're right on plan for being the center of the universe. It's a good thing; it allows you to explore the boundaries of society, test yourself, try on different personas and act freely without fear. But it can also loop around on itself to become anxiety.
time will help change that, but there are also a number of techniques you can learn for calming and de-stressing. I'd recommend www.therapistaid.com for some good self-help material and techniques. You can do this; and if you feel you can't, think about talking to a counselor or therapist. Sometimes we need to see things in different ways to get the best perspective.
