In my youth
Don't talk about your youth.
I could infer that all your experiences led you to your other major... and now you're saying to missevaluated that... how do we know you're not kidding yoursle fnow?
Concentrate on why you are leaving your current major. What was not satisfying in that field that you belivev you can get in tech management? I guess after you frame why you were wrong to be in w/e you are in now, then you can say that you now realize you should be this because of your "youth"
I have a similar experience.
I was a mech engineering major becuase my mother and uncle are engineers, and my grandparents were bio-med scientists. I thought I would enjoy this field of science. However, I failed at it. I couldn't feel passionate about a number directed line of reasoning. All throughout high school I thought I would be an engineer. I was wrong. I soon realized that all throughout highschool, and my youth, that I had always loved the art of presentation, specifically motion pictures. So I want to be a film-maker.
That is just a basic gist. But you need to say where you are coming from, why you're turning away from it, and why this is a good choice for you. Make sure you don't say that studying was hard or something, because no one wants to hear that. I couldn't get into engineering because it wasn't a passion. I should say something about why I first chose it though... but you get the idea.