How can you hide the parts of yourself other people don't like to see/ you don't want people to know?

I would say, that my personality makes me quite ‘episodical’, and part of that is that I can get kind of erratic and extreme. Like sometimes I need to sleep a hell of a lot, and then sometimes only for 2 or 3 hours a night; and sometimes, it seems necessary to wear stupid hats and dance, and sometimes I can’t be near people (and lights >=|) at all.
I would just let things happen because I know that they do, but I do not live alone, and the person I live with, I don’t know exactly what they think, but they look as if they are kind of hurt or maybe ashamed of what I am to them. Obviously I don’t want to hurt them, and also I don’t want to feel what the way they look at me makes me feel…
It sounds like I’m very selfish freaking out with complete disregard for people, but it honestly is something I can’t change, I try to be in situations, places and states of mind that I go to when naturally everything is very serene and peaceful, but I can’t force it, but kind of want to for the sake of our relationship at least.
So how can I try to suppress or channel things so it is more acceptable to them?
They say they want me to be more normal, but this does feel normal to me, so how do you kind of, cover up things that aren’t acceptable to other people?
Thankyou =)