Go read JoJo's Bizarre Adventure, it's a nice stepping stone for anime-to-realistic.
(Part 7 is best for this kind of thing.)

It's good that you're moving away from what's comfortable, but you can't go from one style to the next. You need to know how to draw properly before you can develop your own style (which will come naturally).

So look up pictures of things and start drawing them. That's really the only advice I can give. Study anatomy and perspective and color and everything else. I know that's vague, and it's difficult, but you'll need to just start over fresh if you really want to leave anime behind (I did, it wasn't easy and I'm still learning a ton).