What are you shooting, what are you shooting at?
If you are doing target shooting, then you're going to want to make sure you're using the proper sighting technique.
Here are three sight pictures that you
don't want to be using:
View attachment 900365
The issue with these three sight pictures is that it makes it very hard to be really accurate because it's hard to see a black sight on a black target. Even with 6 O'clock hold, the difference between having your front sight level with the pictured 8 ring, and slightly too high, is impreceptible.
Introducing the "sub 6 hold":
View attachment 900380
Focus on your front blade, the rear sight will go a little out of focus, the target will be out of focus. Level the front and rear sights so that the tops are all flush, then position the sight so that you have an equal band of white all around the front blade.
The left/right adjustment should not be adjusted by rolling your wrist side to side. Hold your pistol, close your eyes, and aim at the target. Open your eyes and see how badly aimed you were. Adjust the pistol in your hand to remove the left/right error. This is why pistol shooters do not release the pistol between shots, because rebuilding this grip takes time.
Work on what breathing works for you, but your shot should look like this...
View attachment 900393
1 - ready position, breathe a few times deeply, through your nose.
2 - deep slow breath in and raise above your target.
3 - exhale slowly and drop straight down onto your mark.
4 - at the bottom of your exhale, stop breathing for just a couple of seconds and apply constant pressure to the trigger until the shot breaks.
If you start to feel oxygen hunger because you're not breathing - abandon the shot. return to 1, and repeat.
5 - after the shot breaks, count 2 before lowering and repeat. Keep looking at your sight picture the whole time. Following through like this is surprisingly important.
This has been the prescribed process I've read in ISSF focused training manuals, and it has worked for me. It might not work for you, but try it and then deviate. Moritz Minder shot like this in 1978 due to an injury, nobody is going to teach you to shoot like this, but he shot a record-breaking 577/600, which stood for two years:
View attachment 900396
Sounds to me like you're experiencing exactly what drew me towards pistol shooting. I can hit the black pretty consistently with the rifle, but starting out with the pistol I was awful, so it encouraged me to train.
Other than this, practice, practice, practice! It's muscle memory and strength. If your pistol allows you to dry-fire, I recommend doing some imaginary target practice aiming at a spot on the wall, even if just to get used to holding the pistol out at arms length, and triggering.