How many girls have you asked out? It's a numbers game — you gotta encounter and proposition (not for sex, to be clear) as many women as possible both to learn the skills and to find the lady for you. Newbie salespeople are told to go get their first 100 rejections, and you're in the same position.
A good way to practice this is starting conversations with strangers in public. Say hi to people on the street. Smile at them. Make small-talk with the cashier. Get your social confidence stats up through trial and error — observe what works and what doesn't. Try various different openers.