Being a teen can be tough. Just try to surround yourself with really good friends that really have your back and also be a really good friend to those who really care about you. If you're not sure about certain things talk to your friends that you trust and your family.
Anything that is within someone else's reach is also within yours. Set your goals no matter how impossible they may seem. Then focus on what is between you and that goal. And then, simply take out the obstacles as they come.