Aaaaaaaah Crompsin, you're a strange and funny fellow
I think Vlad pretty much hit the nail of the head. You have to take risks and chances. You do really have accept the fact the closer you let someone get to you, the more they can hurt you, but it works both ways man.
One day you'll be put in the position where you'll do something that hurts someone else, depending on what kind of person you are, it's a horrible feeling when you realise what you've done.
The truth is, you will get hurt again. But yu know what, it's totally worth it for all the good shit you'll experience.
Just remember dude, nothing lost and is nothing gained.
Sometimes you just gotta launch yourself head first into life and deal with consequences as you need to, just roll with the punches.
All the best with the future man, I reckon you'll do just fine :-)