How do you keep your identity?

I have a 9 mo daughter that I LOVE but I'm struggling with myself - I'm not depressed, just unhappy... unfulfilled. I need a break from being a mom for a minute but when I think to myself about what I would want to do I literally can't think of anything; I feel like I don't know myself, that I've lost a piece of my identity? Now, I'm always mom and sometimes I just need to be... me. It's kind of putting a wedge in my marriage because I just feel like how am I supposed to be a wife when I can't even be me? What do you all do when you just need to be yourself for a couple of hours? Any advice?