I've been there as well bro. Agree like bro Meng said, avoid masturbation and porn for week or two, it will help reset your sensitivity.

Don't thinking about can't cum when have sex, just think about the moment.

If you could not finish 1 hour. Try 2 hours, with a girl that has good recommendation from brothers here. The one that has more GFE service but wild and horny. Sometime if you not feel connection with the girl, it make you hard to cum as well. And you need the one that horny as well to keep up with your condition.

Tell the girl to go easy with lube, this one important. Some wls use too much lube, and when finally the friction make them wet, it will be to much and you cannot feel the sensation.

It might be not a instant fix, but keep "training" (punting lol), and soon or later you will find yourself more relax, and enjoy the session, and you can cum within 1 hour.

Hope this tips can help you