I play guitar .......but I really don't make any money from it. But I enjoy it far too much to ever consider quitting.
If it makes you "who you are", you must do it.
I play video games and get my kicked (* I do not have the time to play all the time *) and I enjoy it.
Unless it is a means to get money or food or shelter, in today's society most do not do it unless they enjoy it.
So my point was, it is ok to walk away if you do not enjoy it.
If you are there for something else, and you ahve accomplished your goal then so be it. If you find out that art or instructor or school is not for you then so be it. Try another one or try something else.
If you want to be the best then put your heart/mind and body into it.
(* Note: Even if I did with music and or singing there is only so far I can go. *)
Accept what you can do and learn to live with it and learn to work around the issues.