Boyfriend thinks he can't pleasure me

We've been dating 8 months and this seems to be an issue that he brings up quite frequently. He thinks he can't pleasure me, even brought up once that I should be screaming and shaking uncontrollably. I cum, but not everytime. And I've never had a vaginal orgasm, like never. Not even from masturbation. I've tried everything. I can make myself orgasm from clitoral stimulation considerably fast up to 5 minutes at longest, it takes him awhile, at least 5 minutes. Which is to be understood, but sometimes I feel like he gets discouraged and it ruins the mood. I've tried faking orgasms, literally everything even Moaning louder. He also believes it's because he's not good enough or attractive enough. I'm at a loss, any thoughts or tips would be greatly appreciated.

Also please refrain from telling me he's immature or needs to get over it.