What do I do? (REOCD)

My past is quite troubled, and for the past year, I've been grappling with immense guilt and fear regarding horrible things I did when I was 19, things I constantly think about that have practically ruined my life.

The problem is that I see a therapist, but she's not specialized in OCD, and even though I've told her everything, I feel like I can't fight my OCD and haven't made any progress with ERP, not even having started it.

I thought about seeking out a therapist specializing in OCD, but I won't be able to tell them everything that happened, and that worries me because I don't know how to deal with OCD and I'm suffering a lot because of all this.

Can I start ERP on my own?