Losing the worldview you’ve built your life around can leave you wondering who you even are now.
No one can exactly answer that question for you, except maybe to say that you’re the same person, only you don’t believe at least some things from the Mormon belief structure. The bigger question is who you want to be.
One thing to do is to go through Church teachings and figure out what you agree and disagree with now.
Another is to study various areas of identity that you may not have fully explored before—things like sexuality, gender, race, and self-expression through whatever kinds of dress and appearance appeals to you.
If you’re looking for philosophical ponderings on what a self even is, consider this YouTube playlist.