So many layers to the question. Here's one layer. Being true to who you are means embracing all aspects of your being and following where that leads you. It means trusting what is right for you and not allowing others to strip you or chip away at your core being. When you're not true to who you are, you're like an impostor at a masquerade: you may be having a good time on the surface, but no one knows who you are. A state of non-youness.
Here's the thing, being who you are may not fit the conventional mold those immediately around you have made. Hopefully, there's no conflict with expectations and who you are, if not, it's a struggle as you either try to fit or to break free. In any case, if you're lucky, you recognize that we're always growing and learning and, I think, always in a state of "becoming."