The way you describe it is the same way I experienced dysphoria. I'd feel physically ill at feeling certain body parts or seeing them. Physical dysphoria is tricky to deal with, but there are plenty of ways to help ease it and help yourself cope easier. I know binding really helps me. I can't function well without my binder because my breasts disgust me so much.

Have you looked into any gender resources? Are there any lgbtqa+ resources at your schooL?