People have said it - it's your desperation. I used to be the same way. It's like how a dog senses anger or a snake senses fear. Chicks sense how guys act towards them. If you walk up to her in the frame of mind that you want a relationship and anything less will be a failing grade, that python will smell it on you and lunge straight for your throat. If you walk up to her in the frame of mind that you are indifferent to her (while still being nice), she'll eat outta your hand. Every girl is different but most girls are like this