Forget the nut, and relax and enjoy the position you'r in... getting a nut is a mental thing as much as physical. If you're too busy trying to please here, or if the position is too much work for you, then it probably won't work.

Talk about it with the lady, if you're comfortable. You may need to direct the angle, speed, etc. to get there. Remember, this one is about you getting yours.

CowGirl is one that will grow on you if you give it a chance. As another has stated, don't let how you cum get into your head. When I think about other shit, the more bizarre, the better, harder I cum. Try thinking about cliff diving and when it time to let it go, let your head it the water. It's a bone crushing nut.

If you can only cum in one position, why not use the other positions as a build up, then go to your favored position when the time comes?  By practicing other positions over a protracted number of sessions without pressure, maybe you'll eventually get over the hump.  Don't know what else to suggest...

or in your case the same stroke... ha ha
who cares...as long as you get there. right?

Try this out:

Wait a long time and go without masturbating, etc so that you are really horny.

See a gal who is noted on her reviews for the kind of position you would like to cum in, and see her.  Explain your situation and that you want her to make you come in this fashion.

After a while, you brain will get acclamated to cumming in this position.

For years I could never cum in a woman's mouth, but by seeing some providers who are excellent at BJs, I can now do it all the time.

It's all a question of practice, really.

yeah...

Yeah, it's better than a hole in the head.

Just surprised to fall back into the same patterns as with civvies.

As others have noted, one way to not cum in another position is to *focus* on cumming in that position.