I am not sure if my penis isn't sensitive enough or if it is an issue with me not being able to focus, but when having sex, I can go a long time without ejaculating (having an orgasm). It can literally take hours and most of the time I give up before reaching an orgasm.
This is causing me a great deal of anxiety as I constantly worry about it when having sex.
My partner eventually gets tired when it takes too long and something gets frustrated at not being to please me.
I don't have trouble at all keeping an erection during all this ordeal. I am a man in my late 20s.
Is there anyone else with the same problem? How do you deal with this?

    

Have you talked to a doctor? Are you able to orgasm when masturbating? What about trying different positions?

This is a tough situation. I would definitely talk to your doctor about it. I did a quick google search and there are medical conditions that can make orgasm difficult for some men. Things like thyroid or prostate problems can cause sexual problems. There could be a hormonal issue too. You need a good physical and perhaps a referral to a urologist.

Believe it or not, you are not alone. This is actually quite common and your doctor won't be surprised or shocked to hear you have some difficulty.

HTH
V