Working out AND dieting

During the past 8 weeks, I have been working out about 4 days a week. Here is what my schedule usually looks like:

Tuesday: Back, Biceps, Abs, and Cardio broken down like this:

Cardio (5 min @ 6.5 incline)

Back Rows (machine)

3 x 12 reps @ 40 lbs

Back Flys (machine)

3 x 12 reps @ 20 lbs

Lower Back Row (machine)

3 x 12 reps @ 60 lbs

Bicep Curls (Single and double hand - machine)

Each arm - 3 x 5 reps @ 20 lbs

Both arms together - 3 x 10 reps @ 30 lbs

Bicep curls, dumbell perpendicular to ground

3 x 15 reps @ 5 lbs

Bicep curls, dumbell parallel to ground, palms down

3 x 15 reps @ 5 lbs

Abs

Ab curl machine

3 x 30 reps @ 50 lbs

Oblique standing curl (each side)

3 x 15 reps @ 10 lbs

Cardio

30 minutes @ 6.5 incline (or keeping heart rate between 135-145)

I feel like maybe I'm doing too much? I don't want to bulk up! But I also feel like I need to start watching what I eat. Overall in 8 weeks, I've lost 8lbs which isn't bad but I feel like if I cut down on the salt and sugar I am consuming, I would see much faster results. Feedback, please!