Becoming a successful pickup artist has ironically nothing to do with the opposite sex. It is 100% about your internal mindset.
First of all, you need to lose weight. If you're fat, no amount of pickup artist lessons will help you.
Once you've gotten your health under control, you need to understand and internalize the true and undeniable fact that you're the prize. That women should be chasing you. And if a woman is not chasing you, then she's not worth your time.
Women don't know how to flirt properly with men they like. This is so important to remember, let me repeat it: women don't know how to flirt properly with men they like.
They don't play waiting games with texting when they're talking to a man they are into, because they genuinely feel they will lose him if they don't text as soon as they read his message. They're awkward, trip over themselves, and get physically close to the man, while saying nothing, hinting for him to make a move. Or they say something stupid to get his attention, and by stupid, I mean I've witnessed some pretty dumb stuff said just to get a conversation going and be on the man's radar.
These are the signs a woman wants to be with you, and these are the women you should be dating. Not the woman who's going to send you a 4 word text after waiting another 4 hours to respond. Waste. Of. Time.
Another way to think about it is: if Brad Pitt asked her out, would she treat Brad Pitt like this? Absolutely not! Remember: you're the one who should be chased, not the other way around.
Never ask a girl for her number, and certainly don't ask a girl for her social media. Instead, offer her your number. If she likes you, she absolutely will text you and start up a text conversation thread. And if she doesn't, well you've already moved on, because the ball was in her court.