Muriels wedding , at a second glance

When i first watched Muriels wedding i was young, ful of hope and believed that something great is out there for me. I liked the movie a lot especially because of the ugly duckling Muriel (toni collettte) and how she finds herself no matter what it took. Even if it meant to look at herself and realize that the very things she despised and was running way from were a part of her and needed to be resolved.
I watched it again over the weekend and formed a very different feeling. I was completely disturbed by Muriels mother. She is a slow witted catatonic peron whom everyone looks at but no one sees her. Her husband is a total bully and her children have adopted the same kind of attitude. She just lumbers about, in a kind of startled expression and is quite invisible to all. So therein lies my nightmare. Suppose i become like that, invisible.
When i was young there was always the potential , the dream of being some one who mattered. And i am not satisfied by the fact that my kids love me etc etc , i always wanted more but could not get it. As time goes by will i become a ghost of myself?