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.
Seriously though, Signal's UI is pretty terrible and they go out of their way to discourage third party clients. It's fine as a replacement for SMS (the way I use it) but if you're used to more fully featured web messengers it's a pretty big leap backwards.