Every year my school has a PHSE day for girls in which they take girls out of lessons to do 'educational activities' while the boys stay in lessons. Only these 'educational activities' consist of nail-painting and smoothie making. I always get really dysphoric as I know I'm not a girl (I don't know what I am) and I can't talk to anyone about my gender. These days make me hate myself, make me feel awful. I want to go back to class. How do I avoid the day while remaining in lessons?
Maybe try and talk to your school administration and ask if you can be excused from these activities. You can say that you’ve already missed some class time, need to ask questions about an upcoming test, or are falling behind in schoolwork. If not, maybe you can convince your parents or guardians to just let you skip school for the day, since nothing actually educational would happen.