I don't know what I should be called. Can you help me?

I have mexican ancestry but never call myself Mexican because I don't think I am. Im 100% American because I was born in America, right? I also don't think it's right to call myself Mexican- American. I wasnt born in Mexico, I've never even BEEN there. I don't even know spanish either. My whole family speaks English. And all of my grandparents and both my parents were born in America too. Where I live most of the people my age call themselves Mexican, and they have parents who don't even know English. They don't accept people like me and I don't fit in. Some people think I'm white and some people think I'm Mexican. My brother doesn't like to be called Mexican so he just calls himself Hispanic. Is this right? Hispanic, Latino, Chicano? I don't know what these mean!! What should I really call myself?