My mum said I'm dumb and now I'm in my room crying?

It started of with my mum saying that I was dumber than all the average students so I basically went to my room and started crying (maybe a little over exaggerated), anyway I started saying that I didn't want dinner but then she started shouting and forced me to eat it. Now I'm back in my room sulking and thinking I might have been a bit over the top. I was thinking about Not talking to her again, any ideas..??