Sticking to the meal plans

I am having a hard time sticking to the plans that I have made.  I know that plans are subject to change but everyday or so?  That is just a bit too much.  I do feel like I need help.  I live in a house where my mother and I don't always like the same types of foods.  So how do I compromise whereas we like the same type of foods?  I guess the only way to know what to do is to formulate a meal plan only for myself within a day or two before.  That is all I know to do.  It is not going to be just pick out food and write it down.  It takes some consideration as well.