You've tried a few pick-ups but have gotten rejected, or brushed aside, immediately, and you don't know why. Perhaps your opening moves weren't positive enough. Perhaps you accepted the rejection too easily; you have to be a little persistent. Perhaps you chose a girl who simply didn't want to be picked up; there are many like that. Don't worry; your performance should improve after you learn some more.
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The BIG Problem. Lack of Confidence. You just can't pluck up the courage to try. Probably your fears are based on the knowledge that you have problems in some (or all) of the five areas already mentioned. Or you may be affected by shyness or an unreasonable fear of rejection.