scared of oral sex😵‍💫

I’ve been seeing this guy for almost a month and we really like each other. We have great sex and he’s definitely my best sexual partner thus far. Since I’ve started having sex, I’ve always focused more on pleasing my partner. While I genuinely like being submissive, I also have insecurities about the look of my vagina and disappointing my partner so those are additional reasons why the guy’s pleasure is my focus. I’ve only received oral twice and I was too uncomfortable to enjoy it. So since I’ve been with this guy he’s offered and pleaded to give me oral and I’ve rejected him every time. I’ll let him finger me or play with my breasts but will not let him give me oral.

Well the other day we were getting intimate and he admitted to me that it’s kind of a turn off that I won’t let me give him oral and that I’m so focused on his pleasure only and it kind of hit me hard. This is something that I’ve wanted to work on for SO LONG but I just get so nervous and worried. How do I get over this and just let go?