There's been some horror stories out there of meeting people from the net, particularly involving children or young teens. Anyone can tell you whatever it is you want to hear so unless you can meet in a group in a very public place, I'd advise caution and NEVER give out private details such as phone number or address.
There's some 'types' all too willing to take advantage of a younger person and they can usually tell if you're young or not and can try to trick information out of you.