In our series, Note to Self, we hear from tech entrepreneur Alexis Ohanian Sr. He co-founded Reddit, which is now ranked the sixth most popular website in America. Now he's investing in other entrepreneurs and companies, as co-founder of the venture capital firm, Initialized Capital. In the last couple years, he also became a first-time parent when his wife, tennis superstar Serena Williams, gave birth to their daughter, Olympia. In a letter to his childhood self, Ohanian looks back on his life.