Majorly insecure

So I basically hate myself, 5ft4 and a size 6-8 but I’m just not happy with my body. I feel like my boobs are shit, my ass isn’t as big as I want it too be, genuinely feel like my boyfriend looks at other girls and wishes he had that. I’ve felt insecure for as long as I can remember and I just want to these feelings to stop 😞