If it's that bad and your teacher is targeting you then you really should talk to a councillor about it. As for football I really just don't think you can do much about that. In Canada between 16 and 18 years old in the education system you require a minimum of one education credit, either PAL or GYM. in PAL the students don't really have to meet any outcomes and can opt out of whatever they want, but in GYM it's much more strict and very competitive. Your physical education class sounds a lot like the latter so unfortunately I don't think you can really get out of doing football entirely, but you shouldn't have to deal with anyone bothering you whilst you play it.