Thanks everyone for your suggestions and feedback:
I guess I wonder about the nature of ukemi- if ukemi means to recieve then why on earth would you ever resist?
Sometimes nage does not have my center, but that doesn't mean i resist him- I dunno
Practise hard very often, every session, while you are young, intensity is important to understand where your mistakes, problems are....
I instruct my uke's to always resist me when teaching waza, to attack hard and hit or grab me with all their strength, if they do not, it always ends up in press ups till they are sick of them!! That makes them hit me or grab me hard, which refines my waza and also theirs. Lackadaisical training is for those who want to cop out of the training they do not desire.....