Let me hijack this thread by telling you about my first adult attempt to set a boundary. Something that was not allowed in my childhood: my mother set any boundaries. Period. We were allowed none.

But anyway, the first time I succeeded in setting a boundary, really succeeded, and not in a hostile but in a very firm way... my T did not like it. He essentially told me I was acting in a mentally unhealthy way. I became convinced (once again) that something was very badly wrong with me, since the authority was telling me so. My breakdown eventually resulted. Not all T's have it together. But this may not apply to your own T, whoever you are.

Hijack over.