Because I sure as hell do. I have an immediate plan but am not working very hard on it (actually, not working on it at all), but beyond that I don't have a clue. Like, it's weird to feel that if I don't make it into a graduate program I'll just pick something and kind of go for it, I guess? It makes no difference to me whether I end up in New York or Arizona or Maine or anywhere because I just don't care. I would be unhappy if, say, I ended up working for an insurance company because that's not what I want, but the things that I do want aren't worth striving for. They don't motivate me. I can't envision my life even a year from now, much less 5 or 10 years, so I can't make any concrete plans. Or I just don't want to.
I'm responsible for my own happiness? I can't even be responsible for my own breakfast!