Is it normal i often get existential anxiety?

I'll be reading a book or doing something as simple as eating, and then I think "am I here? what is this? life is so weird, is this even real?". It sounds stupid phrasing it like that, but I can't think of another of putting it. I'll just suddenly become aware of the reality of life, and this often leads to thoughts on how ephemeral life is, which causes this anxiety.

Anyway, I asked a friend if they had thoughts like this, and they said no, so I was wondering how common it is? What do you think about on this topic, do you have a question similar to this that you feel is unanswerable?