If you are not enjoying it and/or it is too costly...stop
To the OP: hard to beat a simple logic like that, so don't forget: only navigation seems to be your pain point, so if you like the rest (e.g., the view), you might continue with trying a couple of different approaches to tackle the problem, even if it's unpleasant. Don't give up too early.
Quite a lot of people get stuck temporarily on their training, and that's unpleasant for sure. Some fly great but suffer from failing theoretical exams. Some are great in navigation, but suffer from poor landings. Some do both well, but have difficulty in using the radio. I know many with these problems, they got stuck a bit, got frustrated like you, considered throwing in the towel, but continued to work on different approaches to solve the issue and since the success came earlier than running out of options to try, they came out successful eventually.
No pain, no gain!
Ha! There I said it!