This isn't me!

I don't know if it is the advent of my 33rd birthday or if it's a midlife crisis, but recently I have been looking at myself through others' eyes and am disappointed at what I am seeing. THIS IS NOT ME! I'm not the person I see when I look at me. It is as if I have two versions of me. The version my husband and children are familiar with and the person that walks out of my house. I'm not always stressed, I'm not always frustrated, I'm not always uptight. But I get the impression that is how I am perceived. I can do this better. I know I can. The question is, how? What have I started?