i really don't like my weight, i would like to get down to about 50-55kg how can i do this ?

ARE YOU KIDDING ME ????? You want to go down to 50-55. That is really unhealthy you know. You want to be a bag of bones ?
You are heigh and your weight is perfect, i am almost the same height and weight.
It's not the numers that count. It's how you look and how you are confident with it.
How you describe your height and weight is good. You have a model height and a healthy weight. And you are just 16, don't do diets. I'm 17, i can tell :)

eat the right food for your blood type and according to calories and follow some weight lose tips and you will be able to lose weight, visit this site for complete diet chart and weight lose tips

http://www.healthmarina.com/