Coming back from behind is nearly impossible in this game
In general, the game feel so snowball-y, if you lose early game, you may as well say goodbye to the rest of the game because you're gonna be under-statted for the remainder of the game.
Sitting back and farming to try and get back into the game only allows the enemy to claim dragon after dragon and baron while you're trying to defend your base from crumbling, only for the inevitable supercharged stat push to end the game. You'll never be able to contest these dragons and barons because the enemy team is just plain stronger than you are.
It's just a huge feelsbadman.