I am struggling with a lot of guilt over past mistakes. I don’t know how to move forward. I need help

I struggle with OCD and anxiety and just don’t know how to hold any grace or forgiveness for myself. I did some things ( listed on my account but I’m not gonna talk about it here anymore directly) that seem to land in a grey area, but I feel so immensely bad and trying to label myself as the worst case senario and I don’t know why. I’ve tried a lot of therapy, SSRI, ERP, TMS. All failed. I just can’t escape this guilt which a lot of people told me it’s not necessary to this extent. I’ve become my own judge and jury and I’m constantly sentencing myself.