So i haven't played in about a year.

Ive done a few matches and been trying champs i used to like and have been struggling a lot because this feels like almost a different game. Everyone seems to do massive damage or barely a tickle. And turrets seem to have gotten even worse. What happened?i know im rusty and i haven't figured out the meta yet but turrets are taken down like nothing and theres seems to be way more of a snowball effect now then i can ever remember. Once a team is in the lead theyll get all the objectives with no problem and just toy with the other team. Or i shut someone down mid or so but it doesn't matter later on their still crushing people including me. Im just confused not even mad. What happened?