Dealing with a Toxic Friend Group

So last year i was in a very toxic friend group, and was sexually persuaded by my friend, who knew that I am a lesbian. They are male and use he/they pronouns. They made me feel very uncomfortable, and after a while I told them to stop. They started guilt tripping me and saying that its nothing sexual, that we’re just good friends like that. I stood my ground and told them that I wasn’t okay with that and that they should stop or i don’t want ro be their friend anymore. Their actions included things such as pushing me onto their lap, sending sexual photos of themselves and asking me to send mine so we can “compare” them. At the time I was dealing with serious childhood trauma resurfacing, so whenever i received anything, no matter if I liked it or not, i felt obligated to give something in return. This made me feel extremely dysphoric and disgusted with myself. After I confronted him, they had the nerve to be mad at ME. They were upset with me and made me uncomfortable to hang out in our friend group. There was also a couple in our friend group who made me feel dysphoric as well, because he girl i had feelings for was “experimenting” with me and basically using me for sexual favors whenever she felt unsatisfied with her boyfriend. Her boyfriend was also an ass, and whenever her and I hung out he felt the need to come over and be by her, because he felt threatened by me being a lesbian. I asked her if we were ever going to be anything serious and she laughed at me. I felt used and disgusted with myself. Now i’m out of that toxic friend group, but i have to avoid my school club and various lunch spots because when I see them i feel nauseous. I don’t know how to overcome it and I missed so many fun club hangouts because i felt so uncomfortable i had to avoid them at all costs. I have another two years of highschool to go. I can’t transfer. How can I get over this?