The worst mistake a man can make when meeting a girl is trying to jump directly from the stranger phase to the boyfriend phase.
If you meet a girl you like, keep the conversations fun and simple. Don't jump straight into anything deep with her. Tell her that you think you'll be good friends (before she does), then ask for her email, whatsapp.... etc. As she's giving it to you, tell her just to give you her number as well.
The trick is to friend zone her (or make her think she's in the friend zone), before she friend zones you. She'll then wonder why you've friend zoned her when other guys have tried to rush straight in there. That curiosity will keep her interested in you.
Make her wait 2-3 days, then give her a call and tell her you want to meet her for some stimulating conversation.
Take it from there. 
_________________
Prof-Diagnosed: Aspergers Syndrome (I still call it that!), Dyspraxia, Dysgraphia
Self-diagnosed: ADHD-PI, Social Anxiety, Depression
Treatment: 5-HTP, Ginkgo Biloba, Omega-3, Pro-Biotics, Multi Vitamin, Magnesium