For some reason when I play ANYTHING, piano, guitar, mandolin and especially fiddle, my pinky on my left hand has a mind of it's own

(must be a boy finger)...anyway I can't get it to come down....as soon as I'm finished using it it pops straight up. I've been given some excercises to try to make it stronger and so I can control it better....and that's what I've done today....results???? NOTHING, NADA, SILCH, but maybe tomorrow....(I may be a loser but never a quitter)

. I will try again tomorrow....I can't anymore today.....my ego and finger are both hurting!!!