I always understood "I think, therefore I am" to mean that you have the power over your own destiny, like if I wanted to be a professor I could totally become o

I always understood "I think, therefore I am" to mean that you have the power over your own destiny, like if I wanted to be a professor I could totally become one, think like one, act like one etc. I just reread it in this article and realized it means if I have the ability to observe myself, I must exist.