One thing I found when I was having problems with landings was that I was thinking (or perhaps worrying is more accurate) too far ahead - i.e. getting preoccupied with "when should I flare" when I should still be concentrating on the approach speed, or worse still, rushing to arrange the go-around when I should still be looking ahead and flaring.
Try to relax (yeah I know - far easier said than done!) and don't give up - you will get there in the end. It may not be landings, and it may not be within our PPL, but many of us (all of us?) go through a stage like this.
Ali