dear ChiSau,
I had the same problem when I was halfway thru my private license.I totally feel for you.Same with when I first switched from a 152 to a 172.. the latter floated like hell.I couldn't seem to land well consistently and it was very frustrating and demoralising.Then my instructor just told me not to think,just do.And the landing starts at the downwind leg, not flare.Also, my first flight instructor in Singapore emphasized greatly on speed and glide slope perception(if no VASI or PAPI).Just don't give up and believe in yourself.You'll make it. Cheers.