I don't have a girlfriend but if I did I know I would feel nervous around her. Say I had a girl and we passed each other in the corridor at college what would you do??? hug, kiss???? WHAT!!! I dont know
when you have a b/f or g/f for a little while they become a really good friend as well so it shouldn't be awkward for too long. i guess you would just say 'hey' and chat to her or whatever comes naturally.
Yeh man, you may experience some awkward times in your life, but its all about learning. Dont be afraid of teh embarrassin times or youl never get the good times!