I can comprehend what you are saying, but whether or no I am qualified to offer advice is an unknown. But I'd like to try, so...
I don't see self-pity as such a bad thing. As with all things, too much is too much, but at times there is beauty in sorrow. Life is shit, and obscene, and ridiculous, and ominous, and comical. It's too easy to take it seriously. Maybe you need a new perspective? I know; easy to say, hard to do, but don't let someone else's definition ruin your own.
Within literature is held all the so-called 'secrets of the universe'. Whether fiction or non-fiction, if something feels right, it is right. The way I see it, wisdom is wisdom, no matter where it comes from, so don't be in such a hurry to disregard your books' messages. (Sorry, but I really love to read :))
But only you know what you need, and if it's people... err... Bit off more than I can chew with that one. The last person I spoke to was the owner of the shop down the road (her: "Lovely day, isn't it?" - me, mumbling: "It's too bright." - end of conversation.)
You seem to have a good amount of common sense. But 'damaged goods' don't generally damage themselves, and while I may be placing too much importance on the analogy, the "sizeable contribution from others" is what matters. Blaming yourself is illogical when you're suffering, and I stand by my above post - you really do deserve better. If something better exists, it will come. Until then, maybe you already know what you need.
And yes, I know the term 'thank you' seems to have become devalued with overuse. It's also difficult to make it sound genuine when it's typed onto a computer. But still, thank you for the advice you have offered me and thank you for sharing your thoughts.