I got a question, when u sit at the keyboard, are u close or far away?
Believe it or not, the distance between you and the keyboard makes a whole lot of difference. For people with big hands, I suggest sitting back from the keyboard so that your fingers hit the tip of the black notes. That way, it will make it easier to play the white keys better.
For people with small hands, I suggest sitting close to the keyboard so that your fingers can hit the middle of the black keys. That way, you want have to overstretch your fingers for the big chords and octaves.