"Anonymous. Don't write rubbish. You can't name me one teacher or coach or competitor in Latin or Modern who doesn't count. If you don't you will go off time that's garanteed."
You inexperience is showing...
The reality is that counting is almost a sure-fire way to be always slightly off time.
Yes, when you don't yet have a reliable feel for the music, counting is a good place to start.
But at some point, when you have developed a reliable feel, counting becomes an extra thing interfering between you and the music. And that is when you have to stop doing it.
Perhaps from time to time your feelings will get a little shaky and you will want to practice counting some for a while. Perhaps you do it at the beginning of each song. But in the long run, COUNTING INTERFERES WITH MUSIC. It is an extra, though-based translation stage that must go away if you want to intimately involve your body with the music.