Ignoring them is tough, but that's really the best option. Sometimes a very quick wit can also help, but can backfire just as easily. Like everything, this situation can be made into a positive one. If you're able to laugh at yourself, not necessarily at the jokes others make, but if you can poke fun of yourself from time to time, others' opinions will change. The "coolest" people I know are very secure with themselves and are able to take a joke.
I'm not short, but have flaming red hair...trust me, I was the easiest target in school. This all comes from experience.
As for the girls, there's an old expression that applies: "It's better to be thought a fool than to speak and remove all doubt." In other words, don't feel like you have constantly be talking to impress them. Just be yourself and the situation will be fine.
Oh, and sharpen your video game skills...I'm starting to wipe the floor with your scores in the arcade...
