"Trying to Date"

So this guy is "trying to date this girl." What does that mean? I've heard that several times from friends who have been "trying to date" a girl. Is it that difficult? I guess girls, in general, are hard to be with. I don't think I'd be hard to date at all. Why isn't anyone trying to date me? I'm easy to be with. I'm funny, smart, pretty, easy-going, I like to laugh, I'm adventurous. Why is it so hard for boys to like me? I hate the saying, "all the good ones are taken or gay," but I'm beginning to think it's true. . .