Here's what I'd do if I were you. I used to listen to metal too n' stuff.
I'd first start off with fast music, such drum and bass, and then to dubstep.
I'd start with some Pendulum. They use actual drums and guitars at times, hooked up to a synth. This will get you used to the whole electronic synth music idea, as it is also similar to metal rock in terms of tempo and weight:
Then, if you like it, move to this. This will help you adapt to the whole "drop the bass" idea.:
Once you have listened to those and a few others from your own adventuring, I would take a listen to this. The most generic and sterotypical version of dubstep.:
One you listened to this and you don't find it too bad, explore! Find something you like, listen to some BBC 1Xtra mixes and shows.. music is all about sharing art.
Its the rhythm and the synthesizers that make it so good. Its juicy, its full.. the sound is just amazing. Not comparable to metal/rock/alternative whatsoever.