Christ, I hate this question with a passion. Let me simplify things as much as possible to avoid writing a line-by-line assessment of the problem with your attitude.
Everyone has been through shit, plain and simple, including you. Everyone has issues - you clearly have a few. Fuck it, let me delve into this in more detail...
I guarantee they are thinking the same thing about you.
They were themselves just looking to hook up but were not actually into you beyond that.
Why would you ever think that you were able to read people, given what you've already said about your complete surprise that the girls you've met didn't turn out to be the perfect image of a girl with zero baggage that you seem to have in your mind? Case in point...
Maybe because when they feel comfortable enough with you to open up about something they're struggling with, you immediately give off a vibe like the one you've expressed in this thread - "damn, another nutter! Why am I so unlucky?!"
No disrespect intended to you dude even though it might seem that way. Dating is, in many ways, hard nowadays in ways that it wasn't 7 years ago, probably. Not harder - just different. That probably can seem bewildering and will require some adjustment on your part. That said - we always find it easiest to see in others the faults we most fear in ourselves.