Stop taking everything so serious. I think you turn out just fine.

 Be a kid. Worrying about grown up stuff shows up at your door much sooner than your ready for.

 If you like her ask her out and if she rejects you get over it, there will be others.

 Listen more than you talked. Talk less about yourself and you'll find out more about others. Duh? Well for being duh, you sure missed it.

 What they say about steroids are true.

 You don't have to go on trips around the world to be validated by the people you love. You'll only end up more alone in the end.

 Don't try to fit in, just be yourself. You end up becoming a fool. Trust your heart, and value what you have. Everything is going to be alright.

 If you are going to get tattoos the moment you turn 18....think about it first. Don't just choose the first "cute" ones you find. Make them mean something.