That the world doesn't owe you anything (which would make sense, if only because it's not possible to make everyone happy, but the world conveniently acts if YOU do owe it something).
That love in general doesn't make you "complete". Also, at least as far as straight relationships go, it often it doesn't properly meet your needs, it's far too based on financial factors, it doesn't last (though that's not necessarily a bad thing), and most certainly that it's not a warm place where you can be safe with someone else, and even be coddled. No, you're basically on your own, at the end of the day, especially if you're a man.
Well, okay, I did accept these facts more or less, but they suck nonetheless.
Also, that I will always have to live to avoid negatives, rather than gaining a true positive. So, in the case of work, you either find and keep it, and do something you'll likely hate for the rest of your life, or you become homeless. So you just choose the lesser evil, and that's it, and all this for no real purpose, at least as far as I'm concerned, but working for the sake of living another day and then go to work again.