Im only 14 years old but I want to invest in a stock...can you help me please?

From all my life I have been looked down at from what i look like...such has a little girl that doesn't no how to conduct business. I want to become a girl that can succeed in my doings, but also have a childhood. How can invest in a stock...buy, sell, anything that can get me in America's business please help me and thank you for reading this.