This child has just communicated that he does not want to share his feelings about math class with you. Start by taking a deep breath and not taking offense. Know that the problem does not lie with you. You have not started to turn green and grow antennas. The problem is the normal lifestage called adolescence.
Adolescence is a normal life-stage, just like the 'terrible twos', only it lasts a little longer.
You're child is searching for an identity. The 'who am I, what can I do, where do I belong' type of identity. These questions are the basis for every decision your child is making. They are floating around in his head flip-flopping with the need for childhood security that only you can provide. The result from all this chaos is stress for both you and your child.