Hi thanks for asking question. You are too young and i appreciate your concern to become fit and adopting healthy life style. First of all in this young age stay away from alcohol and smoking habit. In your daily schedule along with reading do some outdoor activity like cycling,running,walking, jogging, tennis playing , swimming etc. Try to avoid outside fatty food to a minimum like pizza, burger like food. Avoid refined sugar and refined food to very less. Take chicken, butter , beef meat, pork meat to a minimum. Take green leafy vegetables in your diet.Take fruits daily. Every yearly maintain your body mass index and measure your blood pressure. Try to avoid stress. I hope my suggestion will help you. Wish you healthy life. dr.parth