yes it can be that you shout because you were shouted at, sometimes i say the exact words my mother used to say and i realise as i'm saying it, hey this is my mother speaking, cause yes as children we take in every thing without realising, and then use it later on in life. if i were you i would encourage more reading for fun even books for younger children, and you can try to make a game too, it works wonders for my daughter she say a word and i spell it if i get it wrong(which sometimes i do on purpose) she'll correct me and have another go if i get it right it's my turn(try to begin with simple words) and sometimes we play it in the car or even while we'r doing something at home like washing the plates. well good luck sometimes i know it's not easy not shouting but i realise that when i stay calm i achieve much more