Please, please, please use Signal instead. And tell your friends! Telegram has made very dubious privacy claims, but even if you trust the company, Signal has a far superior user experience. Telegram’s private messages are not enabled by default, and when you are using private messaging, numerous other features are disabled defeating the point.
It seems it's more important to kids today to have stickers and all kind of fancy useless crap. So yeah, it is "borderline unusable" for them. I get this and I don't care.
I guess we have a way to filter out a certain audience with Signal ;)