Ranix Aurus
Languishing in Progress
basing a character on an idealized version of whom you wish you were isn't a bad thing. as long as the character isn't completely stealing the spotlight.
Self-insertion itself is not a bad thing. Heck, most tropes aren't bad actually. It's the usage which easily got corrupted, because when you start self-inserting, you feel a personal relation to it. You become invested. So you started to feel personal on anything the character do or receive, which shouldn't be happening when making story or doing roleplay. It's a roleplay after all. You're playing a role. It's never you in real life, even if you make a perfect copy of yourself it's considered a separate clone, not the you who's playing the character. I don't even know if that makes sense or not hahaha.
Everyone inserted a piece of their own in the world or characters that they create anyway, we can't suppress that perfectly. (Me also guilty of doing it)