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awesome responses, thanks a lot

But this is what i never seem to understand, and its my biggest problem with getting girls:
-Just because she laughs and lets me touch her, how is that enough to let me know she would be happy for me to date her?
How do you know that maybe she just isnt like that to every guy? or that she wouldnt respond the same to touch from any other guy?
Like, how do you know shes not just a nice person, who is being her normal nice self?
Stop overthinking. This is a "problem" entirely of your own creation - made in your head, by you, that's holding you back. Just stop it.
If you spend your whole life worrying like this you will never do anything.
If YOU like her, then you should escalate. That's all the matters.
What she's thinking, how she acts with other guys, etc. is IRRELEVANT.
Just go into EVERY interaction ASSUMING the girl is attracted to you. It's a lot easier and simpler. If she honestly, really truly doesn't like you, it'll be fairly obvious. In this case - SHE WANTS TO FUCK YOU. Now get her on a date and have fun!