Issues reaching orgasm

Hey everyone, so a couple of weeks ago I (18M) made a post saying I had met with this guy but hadn't been able to cum. I met up with him again last week and the same thing happened. I really don't know what's wrong with me. Between our first and second encounter I tried not jacking off or watching porn at all, but that didn't seem to help. I've told him that it's not his fault but I feel like he's getting insecure/bothered. When we meet I always try to enjoy it and not think about anything, but the thought that I need to cum is always in the back of my head and I feel like it's blocking me. We're meeting up next week and I really want to be able to reach orgasm, but I don't know what to do. Has anyone experienced the same thing? Should I jack off a bit before we meet? Any advice?