I don’t feel comfortable

Please someone help me right now I don’t have anyone to talk to about this but my bf and I have sex a lot and I get really bad after sex sadness and it’s so hard for me. I want to do it but immediately after I feel bad about myself and about my body, everything. I don’t know how to talk to him about it. I have made up plenty of excuses in the past but it’s hard to tell someone that after you’ve done it so many times and I’ve even tried to cut off sex completely before but he really likes sexs… ans so do I but it’s so hard. I’m growing to the point where i can’t really look at him afterwards.. not that he’s good at aftercare anyways.. I just need help please..