Ladyhawke is an openly autistic musician, though I never really noticed her singing specifically about it.

Also, the Eurovision winner (fight me) “Cha Cha Cha” by Käärijä might resonate if you look up the lyrics. It is about a struggle to knock out your regular personality for a short while to be happy and free of worries. I am not giving it justice here, but it’s worth looking up. Youtube is full of deep dives into the song.