Totally understand.
I'm quiet too, and I don't think i'm really good looking but I know i'm decent. When I get nervous, I play with my hair.. at school I was really shy and quiet so I would get nervous in certain situations and play with my hair. I also got quite a bit of attention from boys at school and the more popular girls hated me. They used to come up to me at school and just start calling me names for nothing, they would say I was stuck up and loved myself. I wasn't, but they probably thought this because I didn't talk much and the nervous hair thing.
When I got with my boyfriend other boys stopped paying attention to me, because they knew I had a boyfriend. Guess what? the bullying stopped too.
Those girls probably have no idea how much it bothered me, I would dread going to school and became even more quiet because I was trying not to draw any attention to myself.
I don't go out much and most of my friends have boyfriends, but I was really close with one girl who broke up with her boyfriend a year or two ago. Now she is single she is a huge flirt and will go with just about anyone, I went out with her a few times and then she stopped contacting me and cut me off completely. I heard it was because the boys (who were her friends and were always flirting with her) started to ask if I had a bf and other things... It's pathetic. I have a boyfriend and have no interest in them what so ever, my friend knew that. But she chose to lose a friend just so she could get some more male attention? I have now learned that some girls are so insecure they will do anything to put other girls down, attractive or not.
Let them get on with it because they are not worth it, not all girls are like that though. I find a smile goes a long way, even if your too shy to speak.