Yea no worries. Your still fairly young and you will change a lot over the next several years. You do need to work on putting yourself out there. Don't be afraid to make an ass of yourself....just relax.
And yea as for the nerd thing....its kinda in right now which is great for us nerds. There are nerd girls in high school...at least there was in my high school. As you get to college you will realize pretty much everybody is a nerd in their own way.
My gf right now is reading a 400 page book on the history of Wonder Woman, she likes my little pony but her favorite band is Pantera.
There are plenty of people like you with your interests...the world gets a lot bigger...just try to find a place for yourself in high school and once you get to college it will be totally different.
If it makes you feel any better I wasn't very popular when I entered high school but by the time I graduated I was. I'm not talkin captain of the football team dick, but I got along for the most part with everybody....I'm a nice guy and everybody knew my name....but I didn't do it by being quite.
Now lean over and ask that girl if she would care to go see a movie with you and then just ask her what she likes....music, food, school....when ya hit a topic you know something about then talk to her about that....its really not that hard...just relax and have fun.
Completely baffled by a backward indication
That an inspired word will come across your tongue
Hands moving upward to propel the situation
Have simply halted
And now the conversation's done
I am the EgGmAn