How do I get over insecurities?

Yes I know I'm beautiful but I do not always feel that way. Sometimes I feel ugly and disgusting and I suppose it's from somethings I've been through or things people say ik I shouldn't let other determine how I feel about me but i do and it really affects me daily. I'm African American and most women in my age in this day is curvy and have nice bodies me on the other hand I'm 5'9 talk skinny no curves or bios no booty or boobs I'm 140 pounds and I'm just not like most women of my age I'm not fit. I know this may be silly to some people but you can't help to have insecurities and its like nobody accepts me for me I feel very scared and alone in this world. I have family and friends but people just don't understand me sometimes and I hope someone can finally understand and get how I feel. If you don't have anything nice to say don't say nothing at all thanks in advance.