Seriously ... You're 21?!?
Maybe you should start by reading some books on relationships, if you have to ask this question.
I have been friends with this guy for 2 years I moved states and I was going to vist him but Today I got a message him telling me its best not to vist him because his hormones might drive him crazy He's 19 and I'm 21 What should I do?
Immediately move on and start educating yourself on how to love, live and take care of you.
What do you want to do? You're an adult.