Are you hearing yourself?
I'm telling you pickup lines are shit, having worked for dating companies. You, too shy to approach girls, say you think they are a good conversation starter anyway.
I'm telling you, they're not. They're creepy and weird unless you've got great comedic timing, which I assure you that you do not.
Yes I have countless times. The best tip is to go out and do it a few times so you at least get over the fear and understand it's not a big deal at all, because the more knowledge I give you, the harder it will become for you to simply try and start. It's alwasy best to go into your first approaches with a blank slate and ONLY AFTER learn theory, otherwise you're fucking with your own learning curve.