LSD probably wouldn't help on it's own. You'd have to take it and then wander about your town for several hours, maybe visit a new town, unlike any setting you're too familiar with. Follow a guy and see if he notices, then admit to him you're trippin' when he confronts you and note his reaction. Yeah, that might help.
You don't have to be on psychedelics to do any of that, but you can be... which isn't really a very good reason, but hey! haha I imagine that being a psychopath would help as well, because they don't have too much trouble lying (or, creating an interesting story). That aside, you should be able to observe people. Take all you know about your friends, family, enemies, lovers, or whomever and make them your characters. What do you like about people? Dislike? What do you notice about yourself that you see in other people? Maybe it's universal. Meet new people, see new things-- it all helps. Or, at least it should. It's not "cheating;" after all, the only reason we like the characters we do is because they're relatable in some way. Even if they're not like us, they're like someone we know, or they do the things we see people do. Makes it fun to read, and fun to write. Above all (perhaps), you've got to want to write it. Not for the sake of putting words on paper, but for the sake of actualizing an inspired idea.
I've got one I'm working on right now that sounds hilarious in my head, and I'd love to actually write it (actually, I'd love to have it written already), but I'm lazy. So, I guess that's my problem. haha