Singing comes much more naturally to me than playing an instrument. I've been choir singing (through school mostly) and to-the-radio singing for all my life (with a short break because of my voice change ;)).

Instruments, however, I've had trouble with in the past. I took Piano for four years when I was very young, but I was too young to realize I should practice... so I got lots of basic theory and very little ability. I also took trumpet, but that REALLY didn't last long (I'm not that fond of brass - except for jazz + ska).

I'm doing very well with guitar so far, but it's only been about 1.5 months.