Game out of sync

My game is out of sync with other players. I get no aim assist, bullets don’t damage others as they damage me. All other players seem to have wall hacks on and aim bot. It is as though other players are not where they appear to be on my screen. Not my internet as I was on FTTC 70/20 down/up. Now on FTTP 150/30. Tried wired and wireless no difference. The game is unplayable for me atm.