It's not unusual for people that listen to one style of music to be into another style of music you know. That's what I call a REAL music fan.
Everybody has different sides to their personality, and heavy metal doesn't always grab your attention. Personally I can have Thin Lizzy on my playlist, then instantly want to listen to Raunchy. OK, so the two styles are still rock music.
I can also stick on some Clannad (really soothing Irish/Gaelic stuff...think Enya), and then stick on Underworlds 'Second Toughest In the Infants'...or 'Arborescence' by Ozric Tentacles.
A few weeks back, while drinking on a Friday night, all you would've heard from my bedroom window had you passed my house was Freestyler by Bomfunk MCs.
You'll learn as you get older that heavy metal only serves a purpose for a small section of your brain and other styles will start drifting in...even though you'll be thinking "FUCK NO, I CAN'T LISTEN TO THAT...IT DOESN'T HAVE BLAST BEATS OR RIPPING SOLOS...IT'S TOO GAY OMFG!!!???"