This is a quest which will ultimately prove fruitless.
The fact is, we all have two personalities. At least.
We have an outer self, which is on show, and an inner self, which is what I would call the thought balloon self. This is the self that has a running commentary which, if made public, would result in carnage, certainly the end of marriage as an institution, and a drastic drop in life expectancy. There would be no questions of guns being made freely available if thought balloons were made visible.
This inner self is also the repository of doubts, fears, jealousy, envy (the two are different), random cynicism, killing boredom, and most base desires (lust, gluttony,etc.). It also the source of beauty, poetry, a sadness which knows no bounds, contentment, and love.
This inner self is the sanctum of the Wad.
Good old Sigmund Freud divvied the human sentient being into the Ego, the Id, and the Superego. Waddism is a little more succinct. There is the Ego (the outer self) and the Wad.
And that is pretty much it.
Growing up and maturing is not so much a question of finding one's self, for indeed one of Waddism's tenets is that "From life's great trials we do not change; we only emerge as who we are."
The Wad is there. It is sort of a governor on the top speed we reach. It makes us fly, and brings us crashing back to earth. The Wad is our humanity.
The crucible of life is enough to temper the steel of one's character, and it is the hard times which will really define who we are. There is no need to look or discover yourself. The more you try, the more you will be frustrated. Forget about yourself. Think about the world around you and try to open up to the varied experiences, people, and worldviews available in it.
As the Mighty Wad says: Think of others. Be yourself.
Life, as a process, is the mastery (or indeed acceptance) of the Wad which is present in all of us, which can only be discovery by living, and following the singular path which is our destiny. The world will eventually tell us all we need to know about ourselves.