Yes, but not to the point of paranoia. While I understand people's sentiment about p-2-p encryption, some people really do overreact about the lack of it in Telegram atm.

If anybody really wants to hack you (you exatly) - p-2-p ecryption won't stop them, this is not some kind of absolute defence.

And if you are worried about FSB readin your messages - trust me, they don't, unless you are under suspection already. No organisation in Russian history ever worked this way, only selectively.