When you realize you don't have rights to own a picture of your own face

You know how in school, every time they take your photo for the yearbook they send you this sample photo? I was practicing violin and getting distracted and I saw it laying in a corner of the room. You know how it has this watermark that says "copyright protected, DO NOT COPY?" I mean, why does this random company have a copyrighted photo of my face? What are they even going to do with it? I would think that I would have the right to decide whether my face is public domain or not, but nope, I can't copy this photo of myself because COPYRIGHT LAW. Instead I have to buy the photo, and even then, are they selling me the right, or the physical photo? If I buy the photo, am I allowed to make copies of it then? Or does the copyright still belong to "mylifetouch" photography? I don't remember agreeing to this. They still make us get our photo taken. Was this some sort of agreement my parents made for me when I was young? Like what? Now that I'm older can I technically go and refuse to get my photo taken? Now that I think of it, there are probably lots of copyrighted photos of people everywhere. I suppose newspapers and magazines have lots of copyrighted photos of people, and the people in them have no claim to them. We sign away rights to our own image. Actually sometimes we pay someone to take that right away from us. And then I think about the fact that, someone really famous could probably sell rights to take pictures of them, if they really wanted. Because profit! All people want is profit. Do people do that? This whole post might be completely bs because I don't actually know how these things work.