You sound like me and every other student I've ever spoken to. If it was that easy to pick up and get right, we'd all have our PPL's in 10 hours
Seriously, though - it's just part of it, or is for me anyway. I've been doing solo consolodiation and circuits for hours now and I'm okay at them, yet today I did a few practice force landings from overhead the field (2000ft glide approach basically) and consistently forgot my 300' checks.