Not losing ANY weight no matter how hard I try?!........

I'm a 33 year old male, 6'1 and weigh 120kg.  For the past 8 weeks I have made a concious effort to lose some weight and yet nothing I do seems to make a difference.  ( i have only lost 2 kg which is a little disheartening.)  Here is a brief breakdown of what I'm doing...

1. Not on any 'diet' I have just adjusted what I eat and when I eat.

2. Not eating carbs after 4pm

3. Having 4-5 small meals during the day (big breakfast/small dinner)

4. Eat plenty of fruit/vegatables/fish etc 

5. Have massively cut down on saturated fat, eating white, processed bread and sugar

6. Drinking 3L of water a day

7. Taking a brisk 30 min walk each day + 20 min of weights

8. Had thyroid checked - not an issue.

9. Don't eat chips/chocolates/fizzy drinks etc

I know that losing weight is a slow process but only 2kg in 2 months? what am I doing wrong?  Please help.....