go here and check ur fitness :
http://www.mensworkoutguide.com/fitness_calculator.html

but, based on your info, your BMI is less than 20.... hmm... your ideal weight is between 70-75kg.... hehehe...

u r like my friend... oso very skinny.... height same as u... weight 50kg.... he eat very much.... but still can't gain body.... haha... pity him... maybe his metabolism very high all the time.... huhuhu....