When I was 18, my weight was 55 kg and I am aiming for that although I know realistically it cannot happen overnight.
I started exercising (exercise videos
, cross trainer, swimming) for at least 3 times a week for about 40 - 60 minute since November last year. I have also joined a gym and do kickboxing classes as well as yoga. After 6 months, although my clothes fit better, I have lost only 0.5 kg.