If you're high elo and want to improve your play under pressure, play norms with lower elo friends
Literally every time I play a lane role instead of jungle when i play norms with my friends i end up playing a 2/3/4v1 lane where I'm mid and camped by the jungle, get ganked by top, and also the support multiple times per game. It's not really enjoyable to play, but it sure helps me to play under constant pressure. A few days ago I was playing some immobile mid laner and got ganked by the enemy top lane halfway into the first freakin' minion wave.
I don't blame my friends, but damn dude I just play fun meme stuff to make the matches a little more fair so if you could stop sending your entire team to try and kill me every few minutes I'd really appreciate it.
So, yeah. If you want to improve your safe laning, do that.