That... is complicated, as it ultimately relies on your sense of self, which is really not something that an Internet Stranger™ can tease out for you.
You may find the following pages/websites useful:
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https://markmanson.net/boundaries - good starting place about boundaries in general, what they are and where they come from
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https://markmanson.net/manipulative-relationships - post about vulnerability, which is linked to boundaries in that asserting a genuine preference (whatever that preference is) implicitly requires you to be honest, which can be scary
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https://captainawkward.com/category/boundaries-2/ - generally good website about managing personal relations. It's basically an advice column and while some of the cases are *ahem* dramatic instances of wrongness, it also untangles those instances where something rubs you wrong but you don't know what or why or even if it's ok to act on it.
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http://www.baggagereclaim.co.uk/ - has some good stuff about boundaries, mostly oriented to romantic relationships. Not my style but maybe you'll like it. ¯\_(ツ)_/¯
- resources for borderline personality disorder, people managing life after huge relational abuse/trauma? I suggest it because patients/survivors afaik often find it hard to tell what an appropriate boundary is at all, and maybe some of the advice will be applicable to your situation. Maybe not. I am however
in no way, shape or form suggesting that this is a diagnosis that might fit you, or suggesting any diagnosis whatsoever. Just brainstorming.