Is counting up to 10 the same as counting down from 10? I think I've fucked my brain up.

Hear me out, right. If you count up to 10 then the last sequence is going from 9 to 10. if you count down from 10 then the last sequence is going from 2 to 1 yet if you set a countdown of 10 on a stopwatch then it doesn't stop at 1, the final bit is going from 1 to 0. That must mean they're not the same. If I count down from 10 and stop at 0 then that's 11 counts but if I count up I only need 10 fingers to count them all. It doesn't make any fucking sense any more.