Welcome to the "16 and deathly afraid of ALS!" Club!, I'm driving this bandwagon. I'm so afraid and it's good to know that I'm not alone in my fears. Your symptoms don't resemble ALS in any way.
Me personally, I have twitching that started in my right arm a couple weeks ago, shifted to my thighs and calves last week, and has now localized into my left foot for some reason. This fear brings me to tears!!! Do not fall into the trap that I did. I'm so aware of every little twitch and sensation now and it sends my anxiety sky high.
Facts to support how irrational our fear is: neurologists laugh when we suggest ALS as a possibility at our age. Has it happened? Yeah. But here are some numbers to show you how rare it is.
Only 0.03% of ALS Patients are younger than 38 OR older than 92. 5% are younger than 47. The average age of diagnosis is 64-67. The rate of incidence in the general public without considering age differential is between 1 and 2 in 100,000. With age differential factored in, the incidence rate in people younger than 38 is 1 in 165,000,000. Yup, that's right. 1 in 165,000,000.
We're 16. We're in an age group where this disease is unfathomably rare, not to mention the disease is already extremely rare to begin with! Besides, you really don't have any true symptoms, anyhow.