can u answer me?

it seems constantly i come to cross roads and wonder what to do with my life. well so far it seems like i havent done much if i messasure it to the extrem of lifes sucess and yet if i measure it to the hopeless i have come along way and yet i feel like i have acomplished so little compared to the choices and chances i've been offered. i constant wonder what it is that makes some great regardless if its good or bad, and why the rest just are. i guess im just second guessing to much but i feel if i dont question myself then ill truly let my self down but at the same time i feel like im holding myself back to much. what is that truly moves me?