Welcome, Roxy! It's hard to believe you're only thirteen. One of my closest friends has a twelve-year old whom I love like my own niece, but I can't imagine her thinking as deeply as you do.
Hang in there. You only have a few short years until you're off to do your own thing. Meanwhile, I have no doubt that you're smart enough to figure out what you can take, positively or negatively, from your education. Your mom will come around, even if she is disappointed right now. Just tell her and show her you love her, and I doubt there will be much animosity. It seems like she loves you and has made a point of raising a good, intelligent human; she won't be disappointed.
Hang in there. You only have a few short years until you're off to do your own thing. Meanwhile, I have no doubt that you're smart enough to figure out what you can take, positively or negatively, from your education. Your mom will come around, even if she is disappointed right now. Just tell her and show her you love her, and I doubt there will be much animosity. It seems like she loves you and has made a point of raising a good, intelligent human; she won't be disappointed.