Learn to pick up girls by acting cool and being a natural flirt. You can learn how to be totally relaxed, confident and natural when you approach girls. Don't over-analyze every situation, sometimes you just have to not care and let it be, that way you'll just come across as a cool guy. You have to realize that some interactions will be great some won't be and you shouldn't care because now you've found your inner self. Just remember that it doesn't matter if you get a phone number or not, the important thing is to speak from your heart.