>>1 This likely should have been posted in Personal board, nvm
Dude 2 hours of anime that's 4 episodes of anime not really anything to worry about and that's nothing really.
Also you can look at this many ways why they signed you up for karate, like for one your parents must care about you enough they think you need more exercise, or need to socialize more or something else.
Just hope you have a good martial arts instructor.