I have big ??!!?

ok wellz...iam 12 (almost 13) iam skinny iam about 65-75 pounds and iam 4ft and 11in and iam a size 10/12 in kidz size 0-2 in joiners and a bra cup 34B and i have arm pit hair i have lots of hair and still no period is thiz normal??!!! plz answer (gurls) or male docters thank you!!♥♥