Am i a nerd?

They are just mean. They probably also wish they had half the brains as you. Stick with exactly what YOU like to do and enjoy every minute of it! Whatever they're saying about you will be seen for what it is by those that matter - it's immature, ignorant, and meant to make you second-guess yourself. Unfortunately, some people can only boost their own ego by putting other people down. You will end up finding people with similar interests as you that will value your knowledge. Those that can't or won't see that in you now probably aren't worth your time anyway. Good luck, stay true to yourself and make no apologies for your choices! : )