Well that was a necro-and-a-half, but this is a very interesting topic nonetheless. I'm going to ignore all the arguments about pedophilia, they don't seem all that relevant to Tormented's case in particular.
On the off-chance you are still around, the question I have is this. Say you get what you want; you meet the perfect teenage boy, he loves you back, and somehow it is sanctioned by society. What happens when he grows up and becomes an adult? Does the love disappear, because he doesn't fit your abstract ideal of youth anymore? It sounds like that would be exactly what happens, based on what you've said, and you would have as little control over that as you do your longing in the first place.
This is a problem I think so many people go through, clinging to the ideal of youth that was a fantasy from the start, and part of what leads people to cheat on their partners. You say you have an inner child that needs this connection, but it's a universal cultural phenomenon that one transitions from childhood to adulthood, they are two separate phases of life. We all have that inner child in some spectrum of prominence within us, it's what fuels nostalgia and certain kinds of empathy. It seems like you are wanting to give this hypothetical young boy all the things you wanted as a child but were denied, and still feel lonely because you know that time has passed and will never get those things for yourself. Honestly, it sounds like it has little to do with the feelings of the child in question, which should tell you that this might be a challenge for you to overcome and not something to cling to any longer.
These are all things a competent psychologist would explore with you. All I can say is that bottling the problem up inside your head is only making you more miserable and precluding any possibility of emotional progress or development, which is the core of your problem to begin with. You're afraid of changing into a typical "adult" and losing who you are, but realize that you have control over that and you are still going to be yourself. There is a distinct possibility that once you have talked through your issues with someone who is dedicated to helping you, that you might one day be able to look beyond this singular ideal and find a more realistic, yet no less satisfying connection with a mature adult.
Until you work up the courage to do so, I echo the poster who recommended a sex-drive-curbing drug and focusing your energy elsewhere. Yes, you're not interested in sex, but it's your hormones that are making you feel so shitty about your situation all the time. You seem like a responsible person so try to give yourself to others in socially acceptable ways, and see if that helps alleviate this particular loneliness.