Is There A Word For This?

I have a body image issue I guess you would call that, I’m naturally skinny 98lbs 5’2 for some reason I can’t gain weight even though I eat three full meals and snacks in between I’ve been in some pretty bad relationships my boyfriends would make hurtful comments about my weight/body over the years which has caused self esteem issues etc, I’ve tried so hard to gain weight when I look in the mirror I see myself thinner than I appear I see nearly anorexic my friends and doctors say I’m not that skinny and that its just my genetics, I just feel like at 22 I should have a more womanly body I feel like I’m trapped in a 12yr olds body but I was wondering if there is a term for that?