What must I do to be successful?

I feel that I have a lot against me but I want to follow my dream. How can I overcome big obstacles? How can I overcome my insecurity and other people opinions of me? I knew I was different growing up. I knew I wanted to be someone great. Someone that will change the world. Growing up I didn't have the comfort like other people, and I didn't have a stable place. I still don't have a stable place, but I know I want to reach my dream. I just don't know how to stop my mind block. I keep feeling like I am underdog or that I not smart like my classmates. I grew up in the low income housing project. I was surrounded by gang violence, drug addicts, and single mothers. I guess being where I am is a blessing but I feel like I lack the necessary education growing up. I am even doing kumon to improv my math and English skilss, and I am 22 (sadly).