You are a girl but you want to be a boy however you still like boys what are you Transgender?

Gender Identity (the gender you consider yourself to be) has nothing to do with sexual orientation (the gender you are attracted to); therefor, a girl who considers herself male is an FTM transgender who can "like" boys or girls.

Just like a biological man can be attracted to men or women. There is no difference between a transman and a genetic man aside from his chromosomes.