I definitely am, and I've read about many others who are.
From what I've seen, the degree of it can vary from person to person.
In the past I was particularly vulnerable to doing things for others. I'm a hard worker, I like helping people, and my first instinct is towards generosity and good will. Even when it's someone that I don't like and I know they're taking advantage of me, if they ask a certain way it's very hard for me to decline. I've had to adopt a very 'mercenary' or 'merchant'-like mindset to requests to deal with it and it works, but there are still plenty of exploitable loopholes. After having a cherished textbook wrecked and some good tools lost/damaged, it gave me the impetus to be extremely stingy with lending people things, at least.
This is particularly difficult to deal with with conversation topics. I have PTSD and a whole bunch of issues I don't like talking about. You can imagine how that might work out for me. More complications.
Random related thought: Hmm maybe autistics' tendency to overshare comes from the same place as our tendency to do what others tell us to do. It feels similar somehow.
How f****d up is it that saying "No" is not only a crucial life skill, but also one that is rarely, if ever, properly taught.
I'd recommend everyone to read this, and follow the links to other related stuff, so you better understand such things, making it easier to better decisions. Preparation is half the battle. https://en.wikipedia.org/wiki/Coercion
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Thank you deeply for sharing your experiences. I don't feel so alone anymore.