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can you get a job closer to home and save yourself the commute? or cut down to a part time schedule?
what law has it that lawyers have to work such an insane schedule that even if you have a "lifestyle" gig your commute is still taking up 14-20 hours of your week?
yes, get exercise and eat better.
no, don't give up guitar. one day it will come together and while it could take years, you are young and have plenty of decades to enjoy your skill when you master it.