Boob size

I don’t want to come off as having a horrible self esteem buuuut. I just feel like it’s not normal for me to be 16 years old and still be built like a 10 year old. I got my period a lot later than other girls I know and 100% started every type of “a woman’s development” later. I didn’t start to notice me having any type of boobs at all until about 7-8 grade. Even now as a sophomore I’m wearing a 32A, dang near a training bra :/. I jus wanted to know if like. I’m not the only person.. because growing up behind everyone else has definitely effected my self esteem in ways nothing ever has before 🥺