At present, a common international standard to measure the degree of obesity and health is the body mass index as a reference.
That is body mass index = weight kg/ height m? The body mass index is normal at 18.5 ~ 23.9.
Your body mass index =48/ 1.69? ≈ 16.8, so you are thin.
I suggest you make a plan to gain muscle and weight, so that your body will become stronger and return to normal level.