Welcome, PowerMetal. Glad to see a girl who rocks!
I grew up listening to metal, hard rock, etc. with bands like Nightwish, Sirenia, Tristania, Korn and any other band on the hard rock and above spectrum of music. They're the only reason I made it through high school. I had a lot of problems with being a JW around that time. My mom and I got into some pretty intense arguments over it. But in the end, I sucked it up and became the perfect little Ministerial Servant everyone wanted me to be. I hated myself for it. And now at 29 years old, it's causing problems for me, especially with communication in my marriage. If I knew then what I know now, eh? Anyways, hard rock and heavy metal got me this far in life, expressing feelings I didn't quite know how to express myself.
As far as mainstream rock, it is more accepted. I think it's because there isn't as much substance that could be offensive. Mainstream rock tries to provide something for everyone. To me, it's more like pop with slightly distorted electric guitars. It's not necessarily all bad, but it's so generic. Keep on rocking. You can learn a lot from everyone here and from JWFacts.