Wayfriend, you are scaring me with your avatar.
Now I don't mean to make fun of you or be a jerk like HLT

, but I can definitely tell you are in college. College really locks you in your head, and while it is a fun place to explore, you have to get out of it now and again. That's why drinking alcohol and enjoying other elicit substances are so popular in college. But hell, just get out of your head a little and go bowling or something. I studied liberal arts as well, and I know I wrote/talked like this by the end of it.
It did take me 4 times to read through this and get a sense of what you were talking to your prof about. And maybe that is why he/she came off as dismissive - maybe the prof had trouble as well. It really is pretty dense (by which I don't mean stupid - I mean it's like reading through Donaldson sometimes). And as Savor Dam said, it isn't really the prof's role, and there are other professional elements that might come into play with them becoming involved as well.
So if I'm reading this correctly, he just wants to remain friends and you want something more. It sounds like you might have talked with him about this, but if you haven't, do so. It sucks to admit something only to confirm that the other person isn't all that into you, but one of my biggest regrets in life is not telling someone my feelings.
If you have discussed it all and you know these are his feelings, then do you have an open, honest relationship? If so, just try to back off from him a bit, and if he asks, let him know you are having trouble just being friends, and you need a little space for a bit to get your emotions under control. I'd suggest about a month apart, within reason (obviously don't skip classes if you share classes or whatnot). It'll do you good.
If you don't have a very open relationship, then just back off, and if he asks about it, make some lame excuse and get together in small doses for about a month, doing stuff like going to the movies where you don't have to talk.
During this month, do other things to try not to think about him. The best thing you can do is get out of your head for a while, and get him out as well. Try to meet other people. Try doing at least one thing each week that scares you during this time. And if you are having troubles forgetting about him, try something that smokers sometimes do, which is wear a rubber band around your wrist, and when you think of him and don't want to, snap the rubber band. It takes time to get over these feelings, and it sucks to have to give up what you've spent so much time and energy invested in, but it is better than continually banging your heart against somebody's chest that won't accept it.
And as for sex, well, my best advice is to make sure you are ready for it before engaging in it. You still won't be ready, but at least make sure it is your decision and not someone pressuring you. Or you can do as some of my friends had done, and just get it the hell over with. Sex is a funny thing. It really isn't as big a deal as we tend to make it. But it can really bring you much closer to someone, and it can also mentally screw you up for years. This is a dumb analogy, but it's kinda like a loaded gun - things that go wrong can go REALLY wrong, but people fire guns all the time with no problems. It really depends on the intent behind it (and the size of the caliber

).
I hope that helped even a little bit. If not, hopefully you got a laugh out of my stupidity.
EDIT: looks like lucimay got there before me on the advice front, and much more succinctly. Damn the lost post that I had to recreate and stupid work calls.