You're 22 , literally 99.99999% NOT ALS
Emg would show denervation and positive f waves. Even before you felt any twitching or weakness...
The kind of twitching in ALS is so fine you normally can't feel it, much less see it without the help of a strobe light..... It's a fine twitch and by the time you notice them, you're likely atrophied or clinically weak.
Hope this helps.