Is there any reason you are using the PAPIs? They are for instrument approaches, and indicate a faily shallow glide slope suitable for powered approaches by large transport aircraft.
Light aeroplanes (especially singles) normally approach more steeply than that, and any PAPI indications should show that you are high on the approach and should be ignored. The correct technique will be explained in your training manual (Thom or whatever yoy use) and should have been explained by your instructor.
Hope you get this sorted - and I suggest you have a chat with your instructor about it.
SSD