Being a 32A since puberty is absolutely normal. Breasts come in all shapes and sizes. Breasts can also change as you get older and gain weight over your lifetime. If you are interested in larger breasts, seek a consultation with a board-certified, by the American Board of Plastic Surgery, plastic surgeon to discuss your options.
There is no "normal" when it comes to body development. Everyone is different. You developed breasts at a very early age, but this is in no way abnormal.Hope this helps,Dr. JSB