Directing SUCKS!!!!

Ok they don't follow me on here so I need to vent for a second. I feel like everyone in the cast of my film keeps trying to alter the script and it's pissing me off so bad... (Specifically Cici.) Like, I love them I REALLY DO but it kinda feels like everyone thinks they know whats best for the story I created. Nate is the only one not trying to change anything, but I can tell even he isn't satisfied with his character and how loud and bratty 'The Birthday Boy' has to be. It's so hard to speak up sometimes, I never realized how much responsibility being a director has!