I'm going to kick all of my roommates out
Why would you kick all your roommates out?
I'd prefer being the only one in my room. It will be less stressful.
It's their right to live there just as much as it is yours, assuming they pay. You can't just go kicking roommates out just to make yourself feel better. That's very inconsiderate!
They are not really my roommates if they don't pay. It's illegal to live somewhere for free.
If your roommates do not pay the rent and living in your house you have every right to ask them to leave. But you should tell that politely and give them some time to find another place.