Imposter mommy

As I've written before and commented about here, I don't really feel like an imposter as a scientist. But now that I think about it, I do feel like an imposter when I walk around with BlueEyes. For some reason I always assume that people must think that I'm the nanny and not his mom. I think this happens in part because BlueEyes goes to a relatively expensive daycare that we are only able to afford thanks to a scholarship, so most of the other parents are 5 to 10 years older than we are. They come into the daycare professionally dressed for their 'real' jobs, whereas I walk in my flip flops and jeans to go to the lab.
The imposter feeling has faded a bit now that BlueEyes is getting older and I feel more like a mom (yes that took a bit of time to sink in). But I still occasionally wonder whether people think I'm the nanny...