Boundaries in relationship?

Lately i have opened my eyes about our relationship with my girlfriend, so have thinking to set some boundaries to have a healthy relationship, yes we do have a good relationship, but sometimes she makes me down, and doesn't want to listen my point of view of some things, and she hits me face slapping when i don't bring her something at the exact moment, i have let her know that, i don't like these kind of thing, like showing my mood or being a little bit irritated. We have been together 7 months, it is not late to set some boundaries, or will they even work, if she won't agree with some boundaries, then i don't want to waste my time with her, if she doesn't respect me and myself, we know each other histories, and something have come from her childhood, but she should recognize that some things are unhealthy for relationships.
Boundaries in relationship?
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