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And do not listen to that twit who seems to think that you asked for advice on how to lose weight, which was NOT your question, and is not the slightest bit relevant to anything. Hmph.
Playing the guitar gives you joy, full stop. That is the only reason to do it, and no other reason is required. Your husband 'gently asking' 'where do you think this is going?' and your kids rolling their eyes--that's abusive! They are being condescending and dismissive of your joy! That's horrible! Ignore them!
More than that--let them know, clearly and sharply, that you have had enough of their input, and that the activities you choose to do in your very limited spare time are none of their business. Sheesh.