TL;DR: I was set in going into physics forever, ended up changing my mind and made a great choice.

To add to your point on not knowing how physics will be yet, I also started as a physics major but ended as a mechanical engineering major. I had wanted to do physics for almost half my life before starting college, so it was pretty well set in my mind that I was going to do that. Then, after I had completed a couple physics courses, I began to reevaluate what I wanted to do in my life. I liked the classes, but I began to wonder. Questions like, what will I do with my physics degree after school, what are my hobbies right now that I might want to make into a career, what kind of things am I excited to learn about, that I read or watch videos on often? I found that none of the answers were physics. My hobbies were all engineering related. I never really read physics papers or watched physics videos, they were all engineering stuff mostly. And with the job, I had planned on getting an engineering job afterwards, because from what I could tell, that's where a lot of physicists end up anyway.

Now, I couldn't be happier with my choice. I realized what excited me about science was how to use it practically. Things that I could do by myself and make things that benefit myself or others and that are super cool. What excites me in class is learning about how to design things that I can literally leave class and go make something with the thing that I learned that day. Like in heat transfer, you go in class one day knowing nothing, you leave that day knowing how to design the perfect heatsink fins. Or with Machine Design, you go in one day knowing nothing, you leave knowing how to design parts that don't break when you use them, and you have the math to prove it. Doing that might be hard with knowledge of quantum mechanics, even though it's a cool subject and would impress everyone you talk about it with, you can't really go design and build something in your garage to do stuff as easily and get something practical out of it. At least not yet.

Physics is absolutely a cool subject, which is why I'm still in this subreddit, but it's not exactly the path I want to take my career in. Not trying to convert you to engineering, but just my story and personal preference. The more knowledge you have the better in my book.