Hi MapieHearts, I perceive bullying as part of the more brutal but everyday, aspects of the society we live in.
So it's not your fault in any way. But you know that! :) People may advise you to toughen up or something, but I don't believe we should have to debase ourselves in attempts to cope with situations that are not fair, logical or sane. (Even if you could, it's not really like deciding to lose weight or dye your hair! So toughen up is a silly cliche anyway)
I'm so sorry that you have to deal with it. You sound level headed and decent, and a few of us are the very small minority that demonstrate very clear values, are often introverted, hate hierarchies, cruelty, injustice.
I was also often bullied from age around 8 to mid 40's, Ive had & several burn outs etc.
But- a tiny number of environments were fine, even great. Unskilled work was the best. Diverse background of people doing it, all sorts of ages, ethnicities, drop outs, all sorts. The worst environments were small office settings with people that were competitive, but not that competent, and poor Management that were useless at practicing inclusion, didn't tackle stress, and skilled work in the public sector was the worst too.
That's my experience, anyway.
Where are you? Public or private?
I had to move to a big (inner) city in the South of UK to find a place where I fit in/didn't get hassled.
I also used review sites when searching, & treat job interviews like a 2 way process, grilling them on Management style, workplace culture etc. That doesn't always work, but can. Finally, I've been contract, short term, & times off sick in order to try restore better mental health when at its worst.
Oh, and workplace counselling (via HR) couldn't prevent it happening, but we're amazing & helped my self esteem & feelings of value so much.
Oh, & finally, I did start having a go at someone that relentlessly undermined me at work, being sexist, nasty, etc.
It didn't go well, I came across as someone just losing control (I was) but I think it made him think I was unpredictable & possibly therefore to be given a wide berth, and the world didn't end, even though I had the worst anxiety attack if my life afterwards.
It also increased my confidence no end doing that for the first time!
Also search out anti bullying social media, charities too, if you haven't already.
Please be well & I wish you all the luck in the world, sorry I can't be more help.