I think, Therefore I am

I think, therefore I am
So if I am, do I therefore think?
And if i think, am i therefore?

Suppose I think I am someone who I am not,
Does this person who i think i am think therefore that he is who i am?
And if so, who does he think he is therefore, seeing i think i am who he is?
Does he therefore think that he is himself ???
Or does he therefore think that he is, who i was, before i thought that i was who he is?

These thoughts haunt me at 4:00 am in the morning