So I've been talking to this guy that I've known for a couple years now and have been flirtacious with in the past. We are both physically interested in each other, and I continuously invite him to hang out or go to outings. It seems like every time I do he says that he's down to go and we make plans foe it to happen, but then something comes up. I'm the only one who extends invitations or initiates conversation and I feel like the only time he's made an effort was when -after a night of drinking- we ended up hooking up. He says he enjoyed himself and I'm confident in my abilities I guess you could say, but then I keep made an effort to plan times to hang out or go to a concert or party and he said yes, but backed out again. I'm just wondering if I shouldnt't waste my time or if I am just being paranoid? It's all so confusing, I feel like I keep expecting too much of people. No one ever wants to make an effort outside their immediate satisfaction.

Sure, it's possible to try too hard, and how many times do you try before you should give up? I'd say a magic number is 3. It sounds like he likes you well enough, just not enough to get serious. It may just be he's looking for someone a little different. Who knows what makes your heart beat a little faster, and not just out of sexual attraction.
As for expecting too much from people in general, you don't say a lot about yourself, so it's just a guess: maybe you need to get past the fun and flirtatious stuff a little more before getting intimate? Get to know them on a more personal level, hopes and dreams and childhoods and likes and dislikes - all the stuff that never changes from one generation to the next.