See, you may say you're 18, but for all I know, your name is Dave, and you're a 38 year old living in your parents basement/attic/whatever. That is a major downside of all internet 'relationships', in the non-sexual form of the word. Of course, I'm aware it's possible to apply various cosmetic products and appear to be older/younger than you really are, but that's not as easy as just lying online now, is it!
I'm not sure how you'd 'learn' to be a pickup artist, or even why you'd want to. Wouldn't it, by definition, mean that you're almost making a sport out of picking up women (or men, if that's what floats your boat and you're hiding behind an online veil...
), and therefore not making lasting deep relationships.