Ok, this might be a very crazy question, and I'd say it is actually regressive instead of progressive, I still need help. Can anyone explain about how to accurately block emotions? Let me explain:
I have fallen for a girl and the situation is quite terrible. First of all, I have figured out I have absolutely no chance, and I have decided I will not try, etc. I also think the whole dating thing is not something I am interested of right now, etc. So, under a rational point of view, the best thing to do is to stop liking this person so much.
The problem is freaking emotional side, you know, when I see her I have absolutely no way not to look like horribly interested and it distracts me up greatly , the big problem here is that she is often around my college and we share some classes. I think my reactions are quite obvious and they are probably freaking her out, or it could be that she has no idea, I have no way to read these things, you know? What's worse is that after this whole thing, the result is depression, well, perhaps not really depression but an utter sense of sadness.
But really, the best would be to find a way to forget it or block it. Something tells me I'll find experienced people that were able to handle this here

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You could try just intellectualizing the desire. Sufficient introspection makes any impulse, want, emotion, whatever, completely impotent.
Doing this is habit forming and may have depersonalizing results. Do not take in excess, do not operate heavy machinery.