You are overthinking it way too much for one
How long have you been trying it? I am probably worse but if you dedicate a lot of time then you will get better. Can't just start trying something and automatically be good at it. If you have given it time then it probably just doesn't come naturally to you. But if you want anything bad enough you can achieve it with a lot of dedication so just practice like crazy. Also: Don't take anything too seriously or think too hard about it or you will be angry or nervous or some other emotion and you won't do well! Good luck.
Sometimes even if you follow all that is written down in your instruction manual, you will still be unable to shoot as it requires more practice in order to develop a good eye-hand coordination.