You don’t know yourself without a mirror. Read a few stories about kids who grew up in closets for the first ten years of life. No human contact. They can’t learn to see or talk or do anything the way most of us do it.
Other people are our mirrors. So, whether they reflect us accurately or not, what they reflect is how we see ourselves, and how we see is how we believe ourselves to be.
We do have the capability, after a certain level of maturity, of ignoring the mirror. We can walk past it without looking. No more checking or hair or teeth or how the makeup is working. We have enough sense of ourselves to create our own, internal mirrors.
This is a form of self-delusion, but it can be extremely useful. Then again, once we learn to take control of our image of ourselves, perhaps we can create our own reality. Especially if we are really good at believing our own realities, as constructed by ourselves.
I think that people like @dynamicduo are pretty rare. Most of us still peek in the mirror, and some of us stare in that mirror all the time. Sometimes mirrors lie, so if we believe what we see, we can be in trouble. Believing the lies of others is as bad as believing your own lies, I think. There’s a healthy balance somewhere, and I’m sure it’s different for everyone.
I tend to look at myself first, to see my reaction to various things. I analyze those reactions in as much detail as I can, and then I create a model of why I behave the way I do. Then I try to extend that model and see if it works for other people. I ask them what they see and how they think under various circumstances—a lot like what happens all the time on fluther.
Usually, I’m pretty convinced that, whether other people agree with me or not, my model is better than theirs. Oddly, this does not translate into self-belief, since my model incorporates the idea that I do not see things the way others do, and as long as there is a disparity in the different visions, I do not have enough information to base a belief on.
Other people say “fuck it.” Just do what you will. Stop analyzing. It doesn’t help you. I’ve realized over the years, that maybe analysis doesn’t help others, but it sure as hell helps me! So that’s one aspect where I find the mirror doesn’t tell the truth. However, identifying the areas where my self-mirror is lying is not such an easy task.