I’m ruining my own relationship.

My insecurities have always messed with me, but they mess with me even more when I’m in a relationship. I find myself comparing myself to his ex girlfriends in the past, wether my Booty isn’t big like theirs, or I’m not as pretty as them. My boyfriend always supports me and understands my feelings so he doesn’t get mad. But he tries and tries so hard to get me to see my worth. He tells me he loves everything about me & he tells me I’m beautiful all the time. But those voices in my head just constantly tell me I’m not good enough, or I could be better bc I’m not them. I wish I felt good about myself or saw myself the way he sees Me. I put myself in bad moods when I’m with him bc all I do is compare myself. It even effects our sex life. I start crying bc I feel so disgusted with myself and I can’t. I just wanna stop being toxic but it’s so hard to find that love within myself, I just wanna stop ruining my own relationship