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I feel like i have read most of it in theory(david d, mystery ++)
That's the problem dude. You're so into your head so you get scared. After bad nights, don't go back to your pickup books and see what you did wrong, instead just visualize what you did wrong. Body language, tonality etc etc.
My tip for you is; Try to get rid of all that theory you have in your head while you approach. Your head is your biggest enemy. The less you think, the more natural talking becomes, flirting becomes, and you can focus on ONE thing, your body language.