Learning Japanese is crazy cause wdym I forgot how to write “j”??? 😭

I'm currently at the point where I can read Hiragana, Katakana, and a couple words that use Kanji. But I noticed something weird that happens when I become tired, I FORGET HOW TO WRITE J. Like, I have to look at a keyboard or something cause I write it like し and gotta pause cause, "Wait, something's not right"
My brain looks at J and し and thinks: "Yup, same thing" and puts them in the same basket.