Parents are staring to put their two sense in....

Ok... I'm sorry I have to vent this early in the planning process, but is this what families do??? I was excited to start telling my parents my plans.. The places we have visited so far and ideas I'm having. Well..., I don't want a huge wedding nor do I want a big bridal party. I have my sister, my best friend from high school, and another friend that I am close to. When I told my mom my my plans, she started off by saying how she doesn't like one of my friends, and that I should have JUST family in the wedding party, not strangers!! My father even said he dispised (spelling?) her and he doesn't even know her... Ugh!! My dilema is if I have one cousin, I have to ask the other two cousins as well (another long story) and I still would want my fiance's two neices to be part of it. So now i went from 3 people to 8!!!!! As for who my fiance is chosing, his brother, best friend and another close friend, my mom is like he should really have your sister's husband instead of his friends, since he's family.... I know this is confusing, but I have OVER 2 years to plan this wedding, we are paying for EVERYTHING including a house, Why do they have to do this??? My fiance is the best though, and tells me we should do what we feel is right and not worry, but I am worrying. I'm worried about offending people when I thought I had everything figured out...
I'm soo sorry this is long, but I see how all of you are with each other, and I needed to tell someone, since I obviously can't tell my closest friends who of which i want in my wedding.....