Hi. Again the same old mistakes. Never take Endura or such powders as they may contain which may not be mentioned or has effects not very well documented or not known at all as per or past experience. No steroids at the moment. You say you get tired by evening. It is highly advisable to visit a Doctor , who on clinical examination can ask you some tests. It is always better to do so as many diseases are silent and can cause slow but steady deterioration. If clinical examination and all related blood test are negative think of he genetics. If you have a stature and features of he ancestors becided by the gene set-up, it will be very difficult to gain weight. If this is due to medical problems , their treatment will automatically increase your weight with a proper diet , exercises and needed rest to the body.