sort of TMI, but any advice is greatly appreciated

so my boyfriend and I have been having sex for a while now, he is the first and only person I have ever slept with. but the first time we had sex, I was really insecure about my lady parts. so when he tried to go from making out to actually doing the deed, he didn't pressure me at all about it, and we had already talked about doing it, and both said we wanted to. however, when he started to go further than making out, i really froze up. and he asked me if I was ok as he had noticed I had froze up. I told him that I was really nervous. and he asked me if I wanted to wait. I asked him to give me a few moments. so he did. and once I felt that I was ready again, we did "the deed" as some call it. and since then I dont have as many insecurities about my lady parts but now anytime we have sex, I still get insecure about my body. my boyfriend tells me all the time that im beautiful and have nothing to be insecure about. but im still trying to figure out how to keep from being nervous when we have sex.