I don't know how to express or articulate my thoughts and my vocabulary and grammar gets messed up the more I write so I will just write simply.
What I'm trying to say is that every day or hour or minute or everytime you think, you feels like your original selves is dying. I know that we are constantly growing but i just can't stop thinking that whenever we grow or learning new things or start to think differently, our past selves is dead. I think back to my past selves in middle school, highschool and from 2022 and think, aren't they dead? No matter what i do or think or whatever happens to me, i can't bring back the personalities or "me"s from the past. They remain dead and continue to being dead. Unless they are exist in another timeline or universe.
What exactly is identity, consciousness or the self which is me? I don't know nor understand but this idea just stuck in my mind and occasionally appears when I'm bored, stressed or relaxed.
I've always thought of that as renewal of the self instead of the self dying.
Your personality is based largely upon your human experience.
As you get older and experience more, you have more things from the world around you to use to orient your thoughts and feelings on the world, and because thoughts and feelings are what the human experience is at its basest level, it will change your personality continuously.
I experienced much the same through and up into my mid twenties. I have found that upon reaching my 30's that it does not happen as much, or at least it takes much more thought and feeling to change my personality.
You too will reach a point where you obtain a certain confidence in who you are and what you actually believe in, and after that, you will not experience the feeling of being a different person every couple of years as much.
My advice to you since you recognize this in yourself is to pay attention to it. If you can realize that it is possible you could be a different person in a couple years, who would you want to be? What would make you happy?
Focus on that, use it.