I've been this way for as long as I can remember; I too struggled with the same question; "Will it ever go away?".....I have to say, "No, you're stuck this way for life."
I've only heard of one possible "cure" (I hate that word...took me a long time to come to terms with the fact that there's nothin' to cure; nothing's wrong with me; I am who I am, and who I am meant to be). Anyhoo....the only possible solution to fulfill the desire of wanting these feelings to go away, is what's called "Aversion Therapy" which basically runs off the principal that too much of anything can be a bad thing. In our case, if we were to be treated like toddlers full time, chances are we would start to friggin hate it. BUUUTTT....The other side of the coin is that we could possibly just have an epiphany that this really is who we are and completely welcome being treated like a toddler, in which case you're original plan would kinda backfire, but hey, at least you'll come to accept yourself and won't have a "problem" anymore lol. XD
That's the stage I'm at right now. Dad said I can be treated like a baby or I can be treated like an adult but that I can't have it both ways/enjoy the best of both worlds. I have to give them an answer by the time I'm twenty-one (day after tomorrow; January 19th). I've been kinda freaking out on the inside....a part of me really wants to take them up on the offer, but another part of me is scared that I'll end up hating it and my parents would end up liking it and I wouldn't be able to go back to being a big boy. Still have a lot of thinking to do and not much time to do it in. Part of me likes being able to play with my knives and swords and whatnot, even though my once nice bedroom kinda looks like it's been put through a woodchipper now. But another part of me really wants to see what happens to my brain when I'm not allowed access to violent or scary input; plus I have a bit of a horrible potty mouth and it would be cool to kick that habit; I have the vocabulary for it. I read and write at over a college level according to the tests; I never got a formal/official education, I've always had to figure things out for myself and teach myself; in some ways I kinda think I turned out a lot smarter because of that, but another part of me really wishes I could have had the traditional childhood experience of going to school and having teachers and mentors and classmates and all that crap. The coolest thing for me during my five days of highschool before I freaked out was hearing the sound of the bell ring to actually leave the room and go to a different class. That was the highlight of my highschool experience. XD