I started visualizing time as circular from a very young age. I see the days of the week are like segments of a doughnut, with Saturday and Sunday at the top (a little larger than the others) and Wednesday at the bottom. I see the days the same way and also the calendar, with Dec/Jan/Feb at the top. I was in college when we discussed our thoughts about time before I realized that I am not "typical" and that most people have very linear views of time.
A childhood belief about general

others believed things like this
- I thought that "tomorrow" was one of the days of the week— Frank
- I once refused to believe in Thursday. I'd heard there were seven days in a week, but could only name six.Anon
- I always thought that after 1999 it would be 1990 again, but with different months and days of the week
— optional - Having seen enough red octagonal STOP signs in my time, I used to look out for green circular GO signs.— Gary
- That only men farted. I literally started sobbing the first time I realized I farted.Anon
- The very first time I saw a globe (of Earth, yes) I asked where "College" was located.— Shade