I had a lot of difficulty sticking to boundaries and letting myself walk away from situations. I also had difficulty in not reacting to unwanted or unpleasant interactions.

I don't like hurting people's feelings, but you have to realize that they don't have feelings to begin with. The fact that they could be so rude and impose themselves onto you is enough for you to know they're deliberately trying to hurt you. There was never any respect or existence of a relationship, whether it be work, friendship or romance.

If you find yourself reacting strongly it's most likely because you're being triggered along with past wounds. What you need to do is to stop thinking and remove yourself from that environment and people.

Also, if people are going to take continually take offense to good intentions you have or paint you in a bad light, it's time for you to give only yourself that good stuff. No good deed goes unpunished.