Watch cartoons that girls watch. Psychoanalyze a bunch of male characters they husbando (or better yet; read THEIR speculations, since they're almost certainly going to be all over tumblr). Get to know the "types" that girls you're interested in generally gravitate towards, and seriously consider the strengths that women generally find most important in relationships. Initiate interactions with them. Be engaging with your conversations, be cute and awkward but with an endearing personality if that's your thing, or even be a bit of an asshole if you have the style and charisma to pull it off.
Getting girls to like you (never mind "love") is tough if you aren't Chad enough for it to happen with zero effort. But once you build up enough confidence to stay in that head space, it gets a lot easier.