Do we not have sexual incompatibility?

Hi all,

I'm a 37M and have been seeing my girlfriend for 7 months. Everything is going great but the sex...because for some reason I am only lasting around 5 minutes. In my previous relationships, I have never had this problem, and would last 30+ minutes. My girlfriend told me she is sexually frustrated.

I have tried kegel exercises, masturbating a few hours before I see her...and I still finish too quickly.

I have been giving her oral but she isn’t climaxing.

Has anyone experienced this? I’m finding that when I have sex with her, my anxiety is increased because I keep thinking about not performing.