Can’t finish. Ideas to relax?

Hi ladies. I’ve recently started getting more intimate with this guy and I cannot orgasm. He’ll finger me from penetration which was good and I was close but then it died down. Last night he did a lotttt of clitoral stimulation for quite a while and I always like got close then came down and kept riding the waves. Every time he touched it, I jerked and it was fun and felt fine but I just can’t get there.

I’m a VERY logical person that always has control and thoughts going through my head. I’ve heard you’re supposed to relax and I try to but squirming tenses me up. Does anyone have any suggestions on what to try or tips on how to relax?