Scared to stop compulsions

Newly diagnosed with OCD but have struggled with depression, anxiety, ptsd, and night terrors for about 20 years now. Never knew it was OCD! Anyhow, I struggle with existential OCD and perfectionism OCD which has always caused me to dislike “regular” talk therapy because it never worked, there was no point, and I was worried I wasn’t doing it right. Well I’ve started ERP with my therapist, and now every day that I have therapy, I anxiously spiral about how it’s going to be bad, and I’m not going to get better anyway because I’m not doing it right, and what’s the point in getting better anyway. Sorry for the run on sentences. Does anyone have advice for getting motivated for therapy sessions and not fearing them? TL;DR: Does anyone have advice of how to stay motivated for ERP therapy with doubts of failing/anxiety/existential thoughts?

I’ve always thoughts my fears will never come true so it’s easy to discard my thoughts, but recently I realised they actually can come true. If I have an ocd fear that I’ve knocked someone down and I later find out I did, it means my fears are true. So doesn’t that mean my ocd makes sense and I have to keep on doing compulsions like continuiosly checking the road to make sure I don’t hit someone? I’m so confused and it’s giving me massive anxiety

Treatment - ERP Hey so basically I'm just soooo scared to do ERP. I started doing erp with one service and I couldn't cope with our first exposure which was just sitting alone for 20 minutes and accepting intrusive thoughts with no compulsions'. I found this so distressing and hard. I've been moved services and probably will be doing ERP with them but I really don't want to do it. I know it's the gold standard treatment for OCD but it scares me so much knowing I have to do it. I'm scared it will make me way more sick and at this point in my life I cannot afford to be more sick (I'm starting year 13 next month and doing my A-level exams in may) I want to trust that this will work but I'm just very scared. I'm scared that this service will be just as bad as the other one. One of my big fears that we did my hierarchy for with service 1 was around science practicals as that was the only fear that therapist 1. I'm scared that therapist 2 will focus on the same scenario (which is a scenario that I struggle A LOT with) but I can't do that, I'm not sure what my hierarchy will be this time. I can't think of any harm exposures at all but I'm sure she will be able to.