Wat do u thnk i should do??is my gf good for me?

My girlfriend is getting on my nerves.v have been in a relationship for almost 6 years now.first two years she was very dominant and i used to listen to her coz i lvd her and dint want o shout at back at her.then we brokeup for a mere four months and she got into this relationship.she did be saying tht she wnt get into any relationship bcoz she luved me but dint want to stay with me.four months later she got bak with me coz the guy started stalking her trying to kiss her and she dint want to.she came back and its almost four years nw.but today we fought again and her mother is gonna meet me tonight most probably to break the engagement.i dnt want to lose her and at the same time i dont want her to be so dominant.i ve been shoutin at her recently for petty mistakes and shes pissed out with tht.wwat do u think i shud do??if u think i shud hold onto the relationship and sort this out how am i supposed to convince her mother tht it was she(my gf) whos been rong all the time and am the one who always suffers..