Your brother's name is Orion? Are your parents hippies, or just astronomer?
Anyway. I used to listen to whatever was popular. Just picked up CD's from other people, friends, got them second hand. Bought a few CD's from bands I had heard about but I never really knew anything about genres, it was always just "this band sounds kinda cool". Listened to a lot of poppier music.
Then I went through an electronic phase, trance, breakbeat, ambient electronic at night, etc. This lasted a year or two. Right now I still have some in my music collection but I don't listen to it nearly as obsessively as I used to. Around the same time I discovered Nine Inch Nails... Manson... Rammstein, and so on. Started listening to them. Bought my first Tool album, loved it. Rage Against the Machine, Rush, Led Zeppelin, Deep Purple...
Then somewhere along the line I started getting more and more into different subgenres of metal, more extreme, more boundary pushing (to me). I think the first album of this deluge, the one that started it all for me, was probably Ensiferum's Iron. After that, it was Moonsorrow. Wintersun. Finntroll. Dimmu Borgir. So many more, I can't even begin to remember them all.
Now, I usually sit and listen to my old favorites for a week or so, until I get on MetalReviews and see something new that's been reviewed. If the review sounds interesting, I'll get the album. 2 times out of 10, I don't really listen to it more than a few times, 1 of those times I don't even finish the second song.