Apparently your BMI is average due to your height and your weight.
http://www.nhlbisupport.com/bmi/bmicalc.htm
Check there.
If you feel you need to loose weight, or uncomfortable with your looks, do it safely, eat a healthy 3 day meals a day diet, added with fruits/vegetables you like and enjoy eating, cut out the crap, ie; crisps, chocolate, sweets, ect, and try replacing that with more healthy food. Exercise alot more, that should help a great deal, swimming / bike riding I find works best for me, try it with you?
:)
(I know I said I have left, but I like giving advice out here)