Is It true?

Sometime i wonder to myself. Is it true that people came from single-sex schools would find it hard to get themselves into relationships? I mean i came from a all-boys-school and i found it true. I dont know about the rest. But based on my experiences in LIFE, i find it hard to talk to girls in Real Life. I can talk to girls by com easily. BUT REAL LIFE? I cant. Whenever i talk to them, i would freeze up. Even passing them something like a birthday present to my ex-crush(?) it took me all my courage to pass it to her. I dont really know if this is really true ._. HOW TO CHANGE THIS? people say its easy. But for me its VERY DIFFICULT! Sigh. i just want to change this. Help me :(