Sex life struggles

I hope this isn’t TMI for scholars! I’ve never had an orgasm and my thoughts about this get in the way of my sex life. This unintentional model has been going round my head for 10+ years and I struggle to believe any other thoughts.

C: Partner and I start having sex
T: There’s no point in focusing on pleasure for me. If we spend time on me, he might get bored or frustrated (I have no evidence for this second thought)
F: Self conscious.
A: Get stuck in my own head – thinking all these rights rather than focusing on what’s happening. Reject him when he wants to focus on my pleasure and focus on his instead.
R: No orgasm

I can see how my thoughts are causing my result. But I’m really struggling to shut those thoughts down in the moment or to think new ones that I believe.