P90X Week 4

I don't know what I'm doing wrong. Starting to feel like I'm doing this for nothing, because the results definitely say I'm not making fucking progress. If I can sit around and eat carbs all day and go to the gym for 30 minutes 2x a week and not gain a pound, then what's the point of working out 6x a week and eating so much protein I can hardly stand it?

Week 4, Day 1 Measurements:

Measurement	This Week	Last Week	Change	This Week	Beginning	Change
Weight	154.2	153.8	0.4	154.2	156.8	-2.6
Body Fat %	36.7	36.7	0	36.7	39	-2.3
Underbust	36	36	0	36	36	0
Waist	38	38	0	38	40	-2
Hips	39	39	0	39	39	0
Thighs	21	21.25	-0.25	21	22.25	-1.25
Biceps	11	11	0	11	11.5	-0.5