oh dude you'd totally turn into a metalhead with time
do you like electronic stuff, or are you into more emphasis on guitar and stringed instrument stuff? The metal I listen to is usually in either one of those categories. Also, I'll probably start out with some songs that don't have any harsh vocals. You'll get used to them in time, but I think metal with entirely clean vocals is a really good to transition from rock to metal.
Just ask frax lol, he and cthulhu gave me a ton of clean vocal metal, and then the rest is history haha