You mean... Kind of like living? Are you the same now as you were a year ago? I find it scarier to think that my personality might become static! Plasticity is the ability to learn new things.
Well, no, and that's the point! It's not like living, it's an alteration to the natural course of life. Whether it's without negative consequences or not remains to be seen.
This is kinda the nature of life. I struggled with depression until my mid-late 20s. At 35, my high school years seem like a blur - my college years are starting to feel the same. I'm pretty ok with this.