Is moving out a good idea?

I live with my boyfriend right now with my daughter from a previous relationship. Lately I have just been feeling smothered by our relationship. I feel like it is just too much too soon. I got a new job recently and now that I have some income I am considering moving out on my own for a while. I have never had a place of my own. All my life I have depended on relatives or friends for housing. (Well, and campus housing during college). I have never been independent. With our relationship getting more intense I have this desperate urge to develop this sense of self-sufficiency that I never had. My mom says moving out will hurt my relationship with him and I shouldn't do it. But I am sitting here playing housewife to this man and lately it just makes me want to scream. Has anyone else had this experience and can maybe give some advice? I don't want to hurt him but I really need some space.