Yes, I understand the feeling. It's in my personality where I easily find other people exhausting and I always have a need to isolate myself. I am a very private person and even know they mean no harm, when my parents are bothering me a lot and pestering me I can feel trapped. Around certain people I feel like I need to act a certain way and it can be tiring.
I can understand where you are coming from.
This might sound weird, but I feel very uncomfortable when acquaintances just know something - anything - that is happening in my life... Not that there is anything happening, but it is the principle. The last part of your post resonates the most with me; except for me it is not that I become tired faking an act, but it makes me anxious that I cannot be myself, or that others think a certain way of me that is not true.
If there's one thing I'm good at it's creating space for myself. It's a real problem in many ways, I wouldn't consider it a strength at all. We need some privacy of course, that sounds like an awful situation and I would go insane very fast in that shit. Try to separate the perceived pressure from real threats.
That is some good advice Genes. In my situation right now the pressure is not just perceived unfortunately. There is a certain family member that dictates to me what boundaries I should have, and who is allowed to know about things that have happened in my life that I consider sensitive and private topics. If I try to defend myself it usually results in an agitated, or sometimes downright aggressive response. It is really hurting my sanity. For example: there are people that work at the same place as I do who might be under the impression that I am outgoing and enjoy sharing stories relating to my life, but this is not the case. Instead it is just that my personal business has been gossipsed about even though I did not want this to happen.