Im 12 but look older I feel like guys look at me I try to wear loose fitting things but Im one of the few girls my age with a chest What should I do Im scared someone will do something to me?

I think you should ask your parents to buy some clothes that don't show anything or just ignore them they may be perverts. I have your problem to but it's been about a year but no guys look at me. So, remember stay away from them, ignore them, and also maybe learn defense moves.