Grew up with a piano and guitar in the house.
school bands, pep bands, all-state bands, jazz band yada yada  (clarinet grades 4-8, then guitar and drums in high school)
That was all just reading music though. But maybe midway through high school, I began writing my own music. Then had some quick lessons on drums.

I had music theory classes/composition in college, but I barely passed those.

Now I just make everything up!

Played in ska bands as a teenager... was trained by youtubes.

Played guitar since age 12 (13 years), play in an established, touring band, studied theory and composition of music at university for four years, basically always worked on music in some shape or form at all hours of every day, including trackers. Also dabble in creating soundfonts by ripping sounds from SNES roms. It's all paying off, finally.

dabbled in guitar in highschool. put it down for 5 years. went to college for music education. bought some chiptuney stuff. went through the saberpulse tutorial.

tl;dr version - I've studied a few instruments formally - piano, trombone, bass guitar, voice, organ. I've taught myself a few instruments - drums, percussion, euphonium, accordion, others. I studied composition in college and am an active composer for hire and for myself. I've played in some weird bands.

Looks like this thread has had a bit of a resuscitation. Might as well add my own two cents.

I come from a very formal musical performance background, picking up piano in my early years as well as violin in grade school. Middle school came around and my aunt enabled my desire to play drums. I took drum lessons for nearly 7 years with the same teacher before going off on my own and going to college for music education. In between that, I picked up guitar, bass, organ, alto saxophone, and a little bit of trumpet, but my main instrument was always percussion and I was selected to several high school honors bands over the course of my junior and senior years for it. I then had the pleasure of playing both in battery and front ensemble in college marching band. Under Matt Lusky (spokesperson and educator sponsored by Vic Firth) my knowledge grew vastly as a percussionist, and to this day I use that knowledge in all of my writing, whether it be my solo prog rock project, my chiptune works, or anything else I delve into.

played tuba in grade school. metal band in junior high. now this. I'm fucking weird

flute, guitar and piano until i was twelve. 20 years later i use the shit out of everything and don't give a fuck if it's any good.

my dad is a drummer. still mad at him for not teaching me in time.

been playing guitar since i was 12

piano since i was 10

dabbled in some other instruments here and there and then stuck to chiptune / emd

now im learning how to dj (yay)

Started playing guitar many moons ago. Played and sang in bands, mostly loud and angry.
Eventually took up music production, sucked for a long time and then got better.

Probably the highlight of my musical life has been being a regular member of John Richards Dirty Electronics Ensemble and getting to play with Chris Carter and Anna Meredith amongst others.

Annoyingly Johns played more chip gigs than I have, haha.

Woah, rockin'!  I've heard good things about that program haha!

Shout out, music minor at the University of Alabama studying jazz euphonium and trombone under Demondrae Thurman!

I have a Master's degree in tuba performance.

Then get practicing!  You can do it!  Put the time in and it will get you results, promise, k?  You just gotta be patient and persistent.  You can't learn piano by saying you're going to learn piano; you actually have to sit there and practice Hanons... for years.  But all of that starts with you starting today, right?

Started playing keyboard a year and a half ago. Really started playing it 2 months ago, going to start taking lessons in a few weeks. Other than that, nothing really.

FUCK YEAAAAH doppleganger