Boyfriend wants me to cum but I can’t.

Hey so my(31f) bf (37) of 7 months is always somewhat getting onto me for not being able to finish with him. I’ve never finished with a man and only in the last year have I ever finished at all, when I bought my first vibrator. I’ve tried explaining to him that it’s not personal and it’s simply not something that’s ever happened for me with a partner. I’ve asked if we can bring the vibrator into the bedroom but he says that makes him feel inadequate and that I should be able to cum from PIV alone. It doesn’t seem to matter how much explaining I do to him that not every woman can finish that way, he just doesn’t seem to get it. I know he’s had a lot more sexual partners than me (30+) and it makes me wonder if he was able to make every one of those finish from PIV.

The pressure I feel from him to finish pushes the chances of it further and further away.

How can I help him see a vibrator as a teammate?

Any tips on being able to finish with him?

Or is this just a shitty thing for him to make me feel bad about and should I just leave?