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> You absolutely can and should shape your identity around what type of person you want to become in the future.
If your entire identity is shaped by the things you listed above, how is the "type of person you want to become" not also a product of those same things? That is, how are your wishes independent yet your identity contingent?
My wish to change and then taking an action to change is a function of the environment and everything that came before, probably I read or heard about it somewhere. Similarly, perhaps by me writing about it here a neuron will flip in someone else's mind that the way "they are" is not immutable, and that they can take an active role in molding their own personality and likes.
So while your knowledge and perception of the universe is always imperfect, it can also always improve. Pursuit of your better self is the means by which you both improve yourself and your knowledge of what that better self is.