ReallyTired
I agree wholeheartedly, if it isn't fun and enjoyable, pack it in.
Just at the present moment my biggest regret is allowing dd to become so involved with music, but it's only temporary.
I also regret marrying such a talented musician, temporarily.
Sometimes I feel cursed and as though nobody on the planet would relate to it. Then I get over it.
Some people presume I'm a tiger mum and pushed dd until they find out we have much older dc who are completely the opposite, showed talent but not interested in the slightest 
I think musician as a career should be something you do because you have to, because you can't possibly do anything else, where there is no plan B.
Because it is such a hard thing to do, for small financial gain. Unless of course you sell your soul, then the sky is the limit.
Otherwise, play for fun to communicate with like minded people through the wonderful language. To meets friends and play socially in ensembles etc.
I think all children should be encouraged and recorder groups and percussion instruments should be compulsory 
Just ignore my waffle, had a bad day.