I had a similar tricky time during my PPL although by this time I was solo. I spent many a happy circuit session making several cock-ups and go arounds in succession. Reckoned that for a few hours I was landing off about 25% of approaches. Instructor was quite relaxed and said at least I recognized a balls up and had the sense to open up off my bounces. Got it right in the end (mostly) and have enjoyed many a happy approach ever since. Still its still a challenge and one that can be very very rewarding.