Terrified because I've noticed lack of coordination in my right foot (for possibly my whole life)

When I was a freshman in high school, I noticed that my left leg bounced super easily when bored. I could not get my right leg to bounce that well at all. It just felt so clumsy and awkward and like it required a ton of force. I'm 23 now, and it's still the same. I also feel like my left foot taps faster, like more taps per minute (I've been watching a lot of videos on youTube).

I'm worried this is a sign I have early onset ALS. I will add that in soccer I was a strict lefty. I mean, I could kick the ball with my right foot, but my left foot was preferred.

I can:

- run, ski, bike long distances normally

- walk on my toes, walk on my heels

- flex both of my calves

- tap my toes (but faster with my left foot)