I can't cum after loosing my virginity.

So, I (22F) have been dating my boyfriend (22M) for almost 8 or 9 months, during this time we've messed around a bit and it's been great. The first few times I couldn't cum because I guess I was nervous and anxious from having a sexual partner for the first time. However, eventually I felt comfortable enough that I could cum, whether it be from his fingers or from oral sex. Also, my nipples were incredibly sensitive. Reaching an orgasm usually took me around 20 to 30 minutes usually.

Now, he took my virginity 2 or 3 weeks ago and after that I've not been able to cum at all from any sexual interaction with him. I don't feel as sensitive anywhere I used to. My nipples aren't even half as sensitive as they used to be, when he gives me oral it doesn't feel as good as it used to, and he is quite skilled. I feel like I get so close but then I just can't reach that point. I know it's not him becuase he already made me cum many many times before doing the same things he's doing now. He can go an hour giving me oral and I simply can't.

He feels really bad becuase he can't make me cum and he's always been much more focused on my pleasure than his, and I feel bad becuase he feels bad, and- yeah, you get the drill. I feel really comfortable and safe with him, I've never felt anxious about having sex with him, everything between us is very natural, he's never forced me or tried to convince me of anything at all. We've just let it all unfold at its time and when it feels right. I don't feel uncomfortable with him even now. I just feel a little embarrassed cuz aha, I should be able to cum, I'm healthy, I'm attracted to him, and I was able to before.

The only thing stopping me from going to a doctor is the fact that I tried making myself cum alone and I was able to.

Is this normal? Is it going to go away? Is there any kind of vitamin or supplement that could help me maybe relax or become as sensitive as I was before? Something that could help me orgasm, maybe?