The chinese philosophy, gives interesting definition to who am I.
"I" is not the only one I which needs to be discovered by looking deep inside, but rather
The I is a complex mixture of feelings, preferances, behaviour patterns etc.
Thus in chinese philosophy, you can become who ever you wish to be, with the right practice!
Ans there is no "I" to discover, only "I" to make.
And when your friend drives you crazy, it ia not "Him" but rather a behaviour pattern he aquired by life circumatances, and it can be change!
Peace :)