In order to go to heaven you Must?

I was reading the bible and I found out in Revelation that you can't be lukewarm or cold. If, you are then you are eternally is in hell. Last night as I read this I thought to myself what does the word lukewarm mean in bible terns and could I be one. I look it up in the biblical dictionary and notice that I was one. I tend to not but God first in all things. I devoted my life as of last night to become a full time Christian. Not one just on Sundays but one everyday. I took all my worldly CDs and broke them all. It’s was the music that keep me away from having a full devotion in God. I know listen to Christian R&B, rap, and ect. I couldn't be happy now. I feel as if I change something from wrong to right. My method is, if Jesus wouldn’t listen to it then I shouldn’t either( WWJD). I can honesty say that Christian rap, R&B, Techno, Dance, and all other, is must better to listen to. It’s not nasty or have anything to do with fornicating or adultery, lusting or having before marriage. It’s all about love and God. So starting today I’m hot for Jesus for as long I live. So what is your definition of lukewarm.