You're overthinking this.... you should just try stuff as long if it's not too expensive...
About instruments: You could buy a used guitar, it's usually not that expensive and you can teach yourself a lot.
Drawing: It's just a hobby, so I you have fun doing it, that's fine. You don't have to be Picasso
I your painting was selected for an exhibition, you must be quite talented.
Sports: Having bad motor skills is more difficult in team sports. You don't have to do team sports, there are other options like e.g. like swimming, riding a bicycle, running, climbing...
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yeah i got the same problem. instead of thinking and doing, i waste way too much time thinking. and by the time i am finished thinking, the time has passed, where i could've made a decision.
you could take community college or Adult Education classes. or just join a Meetup at Meetup.com. that way, you waste a minimal amount of energy, time & $$.
you can't measure talent. but, talented or not, if you enjoy painting, then why not?
if you join team sports, with bad motor skills, sometimes teammates will get frustrated or annoyed at you. however, if you just play recreationally, that will be kept to a minimum. besides, not everyone is awesome at sports. physical strength, mental speed, coordination.
nature versus nurture
besides, what if you were great at team sports, then what?
the world contains plenty of great football, basketball, baseball, soccer, players. and not very many of them make it to the pros. of the ones that make it to the pros, a lot of things could suddenly and permanently end their career. such as injury. besides, even among the pros that do not have to end their career prematurely, they still have to retire young anyways.