Hello I m just 22 yr old and I have very poor health... thin muscle... low mass, I m still look like

Is it genetic? You should find out. If it is, find out who in your family had that condition. If they had a serious injury or death because of this condition, then see a doctor immediately. If they are still alive or doing fine or died at an average age, still talk to your doctor but don't worry about it.
Hope I helped!!!
-Vermin the Exterminator