how to play the piano for beginners for free

I don’t know what to use my major for after college and I don’t think I am good enough for a professional orchestra. I have problems with rhythm and staying on beat and bow control sometimes too. What can I do to improve?I can’t stay on beat without a metronome which I assume would be essential to playing with a piano accompaniment. I have access to a piano in my garage as well but my parents won’t get me piano lessons. What do you suggest?Is there a career that I could enjoy and get a good income from?Thank you!I’ve been playing the flute for 5 years now in my school band, and I’ve just gotten really serious about it this past year I’m a high school sophomore. I’ve also been teaching myself piano for about 8 months.