The MAIN thing is to find YOUR instrument ! Try things in shops , get
friends to let you try THEIR instruments - One day , one will SCREAM at you "ITS ME" .
I played Clarinet and saxophone before discovering Folk , so Whistle was my first 'Folk' instrument , but you cant sing and play whistle , s0 I started on Guitar , then added Banjo , then Mandolin .
I still maintain that Whistle is 'MY' instrument , as I can play stuff on Whistle that I couldnt play on Clarinet or sax !
AND I get well paid for playing and singing , mostly mandolin and whistle as I usually work with Guitarists !
And I started on Guitar in my late twenties !