How do you deal with performance anxiety?

Male in mid-twenties here, and I was wondering how men in similar situations as myself have dealt with this not so common problem.
It's something I've had for most of my life. I have no problem getting hard or performing, however I have a hard time finishing. Sometimes I can finish with various degrees of difficulty, other times I cannot finish at all. This is mainly a problem when I'm with a partner. When I'm by myself I'm usually fine (that's why I attribute it to performance anxiety)
Normally I don't mind since I can last longer and sex is still enjoyable. But the girl I'm dating recently seems to be really upset by it, and no matter how many times I explain that it's me, she still thinks there's something wrong with her....
Hence I'm seeking the advice of this great sub.


Source.

That sounds more like finishing anxiety....been there, after too many beers lol.
I'd just fake it and get mine the next morning

How the hell do men fake it? I can feel when a man gets off, so I'm not understanding how or why this would happen.

I'm just that damn good