I graduated from Medical school. Then wanted to pursue my career in research. I chose Immunology and I was doing PhD. But my skills were not good and I was fired during my studies. My supervisor said that I am smart and clever but I don't have skills. I always wanted to be a scientist and I feel that I am not good with experimental approach. I am thinking of choosing mathematics from a Bachelor's level and then to continue with theoretical physics or theoretical biology, whichever I feel comfortable with later. Can you please guide me if I will be able to do some good? Or Should I lose my hope of becoming a scientist and go back to medicine? It is a very big decision for me as I am 30 years old. Please advice.