But you aren't a productive employee in their eyes. You have become a high maintenance, problem employee. They are hoping you will quit.
The trouble is, like all of us you really need a job.
My bro told me that if I quit I will be unemployed for around 1 year, pretty scary. Needing a job is important, but I have also postponed to have further studies in music, even I am risking admittance exams this year because they could be around the same work time hours.
A teacher has told me that she could help me in getting another job, one that could suit to my needs. Even thought I see her good intentions and will to help me, I am somehow leery, feeling that in the end I am alone in getting a new job, but also I can't wait and do nothing.
My advice, hard as it will seem, is to turn it around and become their best employee. Ask your boss what you need to do to improve, take it seriously, show that you are worth it.
How long do I need to stay in order to show that I am one of their best employees?
Most people can work full time and manage a class or two. No excuse for not passing theory, that's just doing your homework. Gaining piano skill is another matter.
That said, sometimes there's another way. To get more education, I requested the night shift at work, and went to school in the day. Work didn't owe me any favors so I had to wait a bit for the night shift opening but then I jumped on it.
I wish you luck, because that's one of the reasons my work performance started to withered. I wanted more time for my education, for a time it was good. However, despite my musical progress, my manager (aka the company) demanded from me to have a more active role in the company, to be a leader, meaning to give more time to them even if it is around my non work hours, he received complains, and I had communication problems with him.
Then, since January, I started to fell drowsy at work and despite maintaining a good performance, I didn't want to change shift and I tried to keep the good job I had, until the disasters of last week.
The good thing of that was that it reminded me that I need to quit, the bad thing is that because of those incidents I feel I need to postpone my leave. I was thinking to leave in a month, but now that I checked that I have become to my manager's eyes a bad element, I am afraid to sacrifice this year my studies and remain in the company for longer, specially because I promised to improve by signing a contract.