There is so much I would tell my younger self. If I could go back and be 20 years old again I would say so much.
I would complain less because I now know the true dilemmas in life and I would always be positive. I would also not care what people think about me because those people do not matter in the future. I would tell myself to study more and emulate success. If only I could go back and teach myself the things that I know now.