Ladies some advice ?

Well today we tried car sex & I did reverse cow girl with him sitting down of course for the first time and he came in like a minute maybe less ...lately it’s been that or no sex he’s been working a lot ...but I have thought like is it me am I bad at sex that he cums fast ? Or do I need more work ? Idk I thought I was ok in that department ..should I have slowed down ..I was like bouncing but then he stopped me kind of so then I started grinding and then he cummed ..ladies please leave your comments on what I did wrong , advice & tips my anxiety is on high lol