Taking Too Long to Cum

Ki

So, normally me and my boyfriend have an AMAZING sex life. We tried some new positions a couple nights ago and they were great! Tonight, I wanted to try cumming while he was inside of me, which is something we don't normally do because, like the title says, I take way too long because it takes so much focus. He wants me to cum, and he tries so hard, but it never happens so I give up and happily just let him keep going until he's done. Anyway, we were trying the position out again while I rubbed my clit and after about 20-25 minutes of straight fucking, he says "I need a break" and pulls out and takes some breaths. I rolled over and started laughing, and I apologized. But then he sighs and says "How have you not finished yet?!" and it just hits me hard. I just started BAWLING. I was sobbing and he just pulled me against him and I could tell that he felt awful. I'm very embarrassed that it takes so long for me to cum, and he knows that. But he didn't realize he would hurt me by saying that. I try really hard. I gave up my vibrator because it was decreasing my sensitivity, and I thought that would help -- It didn't. I guess I just have a tiny, useless clitoris and I probably will always have a difficult time. My boyfriend did apologize, and he feels guilty and wants to re-try and see if he can help make it happen, but it's not a big deal if he can't. Does anyone else have the same problem? I can do it just fine on my own, but it's so hard to during sex. I want to feel like it's not just me. 🙁