I am probably not the best person to ask this, being a confirmed rationalist and a fairly heartless cynic, but I'll give it a go.

Relax. This happens a lot. Dreams are good, and necessary, but they can sometimes blind you to reality. You could be working next to your ideal guy by now, and never even see it. Love isn't blind. People are - willfully in most cases.

The problem with keeping the dream alive is you keep racking up your expectations. There is a very skewed perception of love available in books, TV and movies - it is a trite, hackneyed formula that lazy writers - that is, nearly all of us - use.
You absorb that, over time. It changes your attitude. So stop watching and reading that rubbish, for a start. Take in a couple of good, violent action comedies or something. I recomend an evening with a bottle of wine, and Hot Fuzz followed by Naked Gun as a perfect antidote.

Now, lets drill down a level. You are getting bitter because it seems to be happening all around you, but isn't happening to you. You are rapidly going into spinster mode - either the chill and bitter version, or the desperate version. You can say all the right things when you meet a guy, but your body language is saying something completely different.
Guys are considered to be slow on the uptake as far as body language is concerned - this is total codswallop. Guys are hunters, they can smell desperation a state away and it is like a cross to a vampire. Chill and bitter is not quite so repellant - most guys try "thawing the ice maiden" at least once in their dating lives.

You know what I am going to say to you. To kickstart the dream, in it's more healthy form, you need to revisit all aspects of love.
Get happy with yourself. If you don't love yourself, why should anyone else? Have posted enough about that these last few months already - dig through the archives.
Get out there and meet new people. Just for the pure pleasure of meeting people. Desperation comes, in a large part, from loneliness, so you are not looking for a relationship or lovers (though if that happens, go for it), you are looking for companionship. Friends.

The fairytale needs to change. It is hard for the prince to gallop up to your door on his fiery steed, when you live on the 20th floor. You have got to meet him half way.
'Cause the one thing that the tired old romance plots do get right is it happens when you don't expect it and are not looking for it.