I need help communicating with my mom?

Well my mom and I are having a hard time talking and communicating with each other. I hate to express myself and show how I feel where my mom is always telling me her problems and complaining that I never tell her anything. When I come home from school she asks How was your day ill say fine and one day I asked her why she continues to ask me that when she knows what im going to say and she tells me that maybe one day ill tell her everything well that isn't me and it isn't going to happen. Now shes 50 and im 12 yeah im young but one of the reasons i don't like to communicate is because every time i open up everything turns into a fight. One night ill be all telling her about my day and being weird like she likes and then the next day if im not like that she gets all upset saying im being rude or something an another reason is all i really like are listeners where if i told my mom i got hurt she would over react and say did you ice it what happened are you ok let me see it or if i told her something bad that wasn't injury based she would go and take my other side so if someone was teasing me at school or something her answer would be well did you do something to make that person mad or something like that i try to tell her what she does and how i don't like the way she reacts but then she still doesn't change but instead complains saying im always having an attitude. Now how is that an attitude. She always says that i have an attitude and im always rude and how nothing she ever does for me makes me happy and so she is saying how tonight we are going to have a talk and go over certain things and im deadly afraid of "talks" oh and one more thing, i am always going to have a slight attitude its my personality and its not something i can change. Most of the time when im having a so called " attitude " Don't even know it my mom just starts getting all upset but i mean im tired of her always trying to change me and please don't say that my mom is going through menopause because she isn't but please give me some advice on how to and what to say to my mom in our " talk "