The difference between a salad and a burger: Nothing.
The difference between a salad/burger and a rack of ribs, an ice cream, onion rings, and extra french fries: A lot.
Weird. Personally, I never mind when a girl starts talking to me... But whenever I add a girl I think might be cute, they get creeped out and don't respond. Either that or they just deny my friend request.
Maybe you should ask your mutual friend to set you up!
Be happy... Smile a lot, wink, wave. A positive attitude attracts others and gives off a good vibe.
Good for you. Life is too short to live depressed... Be happy, be confident, and enjoy it!