Do you ever feel like you're not doing enough?

I had an interview over the weekend and while they seemed very receptive to me, I look back on it now and wonder if I did enough. There were other candidates I'm sure and I put my best material forward (they even mentioned reaching out to someone I went to school with), I just get this itch like I didn't push hard enough. It will be a few weeks before I hear, but the anxiety is killing me.