How to stay calm and not rush things?

How can I stay calm and not rush things when I feel desperate and that I am never going to get a girl. It is like right now I feel mad lonely and I am not getting any younger. Yet I have a small inkling of the problem my confidence to break the touch barrier with girls and to show them how much I like them, yet it is so nerve wrecking for me. Maybe someone can tell me how they got over the same problem. Every time I say I am going to change it with the girl I am on a date with it is hard for me not to come of as nervous or to worried she might think I am creepy or just trying to cop a feel.
How to stay calm and not rush things?
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