Attracting suffering people
There are unconscious and subtle signals between people. It can make a compassionate person prey for some dangerous types so it is so good that you are aware of what's going on. (Not saying fibromyalgia, CFS, or dyslexia folks are dangerous but some mental disorders can be). They are interesting as friends but don't make good marriage partners, at least not the potentially dangerous ones. It seems like there are also just a lot of people needing help these days. There's a lot of info online about empaths attracting narcissists and sociopaths.
I don't know that you need to improve or change yourself, tho. Just be careful not to marry someone with a mental disorder, IMO. I don't know where you meet people but maybe you could meet healthier people in healthier settings.
I also have had a long history with the mentally ill, and I plan to only look for healthy people from here on. The unstable ones have taken a lot out of me in my lifetime, and that includes a sociopathic/bipolar ex, an aspergers dad, and an HPD/OCD mom.