dont touch my belly

is it just me or can anyone else relate to me ? so im bearly starting to show and Im really close to my grandmother ( I dont have a dad in my life , shes the one whos raised me and helps me with everything she can ) well , whenever I go visit my grandma , when me and my boyfriend have to leave I always hug her and give her a kiss and tell her to touch my belly and she does I have absolutely no problem with it at all but once im walking out the door my mother forces a hug and puts her hand on my belly and im not trying to sound like a bitch or anything but I hate it when she does that . I dont like her touching me and especially not my belly , like if I dont give you permission to do it then dont touch it .  I cant tell her this because shes so sensetive now and starts crying and says that I " hate her " and its not that I hate her its just that I dont have any love for her at all she never took care of me or my sister and now that im going to be a mom shes gotten so annoying shes trying to be mature and  we always used to joke around with her but now she gets so offended and starts crying she even almost yells at my boyfriend like relax . and when I dont want to hug her she always tells me to not act like that and says " stop , youre gonna be a mother now you cant be like that anymore " like what the hell does that have to do with anything ? im going to be a better mom than you ever were . you cant force someone to like you and you cant force someone to make a bond with you . 
idk I just needed to vent , please dont judge me .