WTF Riot why do tanks not die!

So we are playing against Shen support and this guy is being focused by 5 champs and still gets away!

I play rammus jungle, I get fed, I'm against a full assassin AD team and I can run into 5 of them and just not die.

Like OMG!!!!!! Tanks OP! Nerf the world

Disclaimer The above is true but everything else is a joke I'm having fun with runes and felt I needed a tank post just to offset the echo chamber of this forum