what is the best way to overcome shyness?

I find that it helps to talk to other shy people. I can talk to both shy guys and girls with much less stress than when talking to more talkative people.
But I still get intimidated when talking to a guy that I like. I think it's more of the rejection that scares me.

I have already acknowledged my shyness. That is the first step.
Then you're going to want to try small talk on various people as often as you can. When you feel shy around someone, don't back down, because that's only rewarding the shyness.
And just keep at it. I'll probably write more when I can think of it. But right now it's getting a little late for me.