When your old self dies

I recently saw a post on TikTok from my friend where he basically showed some old photos of himself with captions similar to "despite everything, it's still you" from Undertale, and it made me think about how much we change in a short time.
I liked the idea of ​​despite everything, you still remain the same person, or at least maintain what's good about you, something that I at least believe I'm doing. But I've changed so much in these last few years, the three years of high school show that well, in 2023, 2024 and 2025 I had completely different mindsets from each other to the point that the me of today can't even relate to the me of 2023 and 2024, this is certainly due to the facts of life during those years, like in 2023 when I was VERY needy for a girlfriend, to the point of being annoying and idiotic, in 2024 I already got a girlfriend and as a consequence I had already "matured" in relation to the previous year and in 2025 I had already broken up and now I was thinking about the responsibilities of being 18 years old and in the years before that the difference was even more striking.

And the question remains, "Who am I?", I find this question kind of silly, not because of the answer, but because I've heard it asked to "make me reflect" several times before, and I'm doing it again. Nowadays, I'm certain about the things that define who I am: my tastes, my personality, my attitudes, my positions, etc. But I've kept very little of that from a year ago, and almost nothing is the same as it was two years ago, so is it possible to say that I'm still me?
Of course, I'm still in my youth, and it's still possible to define a true "me," but until then, I believe that many "selves" will be erased, and only the lessons, memories, and regrets will remain, and these will probably be my achievements until I can do something truly memorable, or at least until I discover what I could do that's remarkable in my life that goes beyond a memory that fades with time, like almost all of my life so far. I like to believe that I'll have the necessary time for that.