pretending

It still always surprises me that I'm an adult person. I feel like I'm just going about my normal activities and just being me, but then I catch myself doing grown-up type things and it feels so weird. It feels fake, like it's not really me.
Maybe I'm not explaining this well. But it's like when I go to the bank or the post office. In my brain, those feel like "grown-up" activities. Children don't tend to go to the post office by themselves, and even fewer venture into a bank without an adult. I know that I never did. They always seemed like secret activities reserved for the select few who made it through childhood. And suddenly, I am one of those people.
Many of those "grown-up" activities still feel so foreign to me. When I cook an actual dinner, for example, instead of eating soup from a can. When I use a credit card. Even when I drive places or have "errands" to do. It feels like I'm playing house. Because I can't possibly be old enough to actually need to do these things.
But I guess I'm just going to keep pretending until it feels natural. Because I'm sure it eventually will feel normal and I will feel like a person and not just a being in transition.