Well...I've quit quite a lot of random instruments. I took piano lessons in kindergarten, first grade, and a little in second grade...and then my friend's mother did try to teach me some basic piano in 5th grade...
Like everyone else who grew up with public schools, I also learned to play the recorder, but I can't remember how to play it anymore... (I never really liked the sound of the recorder though- it's a little harsh...)
During...I think 3rd-4th grade, I took violin lessons, but I eventually quit.

(Hehe, interestingly enough, my brother is still playing the violin and is in the school orchestra. Unlike me.

)
In 5th grade, I learned how to play 5 notes on the flute, but then we moved and my new flute was kind of broken (It wouldn't play the D or Eb notes...), so that fizzled out around there...
~~~
So, now I'm basically stuck with my weird singing voice. Which would probably be OK, except that it's incredibly high... If I put some effort into it, I can actually sing a couple of fairly low notes, but there's like a 2 octave gap in between (I have no middle range in my singing voice...

) So,
Ailuro-san, rest assured, you're not completely alone.
So, anyway, this kind of weird singing voice means that I can't sing atleast 95% of anime/j-pop songs without sounding really messed up. >_< I
have tried practicing to increase my vocal range (I spent the past year trying very, very hard~), but the tiny scrap of progress I made seems to have vanished after school started...
But at least now I can sing louder than I used to...

It's fun trying to imitate Amy Lee's voice from Evanescence...
(Wow, that was a really long post on random wasted musical experiences...

)