The act of putting a name on some traits that you have can seem liberating: I finally know what I am, and why I’m different from others, and that’s fine.
On the flipside, once you commit to a label, you lock yourself inside it, and instead of describing, it begins shaping what you are.
It doesn’t help that other people often try very hard to pin us down and assign labels to us forcefully, without considering if we’re OK with that.
The trick is to describe your behavior and separate that from yourself. Instead of being an introvert you can just say that my behavior was introverted, and that was a function of my internal psychological state.
Also, be open to experimenting with what affects that state, and reflect on it. That will remind you that you’re not a constant, you’re a function :)