How to stop psyching myself out?

There are times when I want to say something or talk or speak up, but most of the time im afraid to say it. Im a bit socially awkward, but im never afraid to smile at people. Sometimes when a girl smiles back I wish I could say something, but then I walk away and avoid the opportunity. Even when a guy is talking to a girl I like, I walk away from that too. I ALWAYS psyche myself out and end up feeling regret in the end. The best way to describe me, just watch this scene. This is from the film Watchmen. Look at Nite Owl's body language (although I feel more like Rorschach, he looks more like an introvert)
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The movie was good, but i prefer the graphic novel. If you've never read it, its a must
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