Does leaving a day inbetween your workouts make you weak?

I am 14 and I was working out every day and I wasn't getting results so I started doing my workouts every other day and I am feeling as if it is a lot more challenging and it is taking me more time to complete it, so is leaving a day in between good in the sense that you give your muscle time to regrow or is it bad because your body is used to a lot and now is not getting much strain?