The Problem Is You
It's right up there with, "Don't trust anyone with a misspelled tattoo." Truth is, there are a lot of bad people, bad situations, and just plain badness in the world. But YOU are the unifying factor in all that you encounter.
If you go through a dozen jobs in a dozen months, it's not because your bosses are horrible people who spurn your dreams of advancement. It's because you need to get yourself together and do an honest day's work.
If you cut ties with a dozen friends, only to alienate a dozen more, it's not because they're toxic or graceless or ungrateful. It's because you have a lot to learn about friendship.
If you go on a dozen dates in a dozen days, and all of them end with your companion of the evening crawling out of the washroom window, it's not because your city is full of undatable, unlovable crazies. It's because you are turning them off somehow. Go up to your most honest friend, and ask, "Why am I single?"*
Remember: You are the unifying factor in all that you encounter.
In the comments, bitch about anyone who lacks personal responsibility. Or, just bitch. I'll listen.
*One of these days I'm going to start a blog called "Why Am I Single?" I'll ask people to send in their romantic histories, and I'll tell them exactly why they're single. It'll be a kick. Once I sift through all the tears and death threats, that is.