I'm going to ask my roommate for more money.
Is your roommate already paying their fair share?
Yes, but I just want more.
It sounds like you're asking for too much from your roommate and you can be seen as greedy . Be satisfied with what your roommate is already giving you.
I should be able to get as much as I want since it's my house.
You should take other factors into consideration. Good roommates are hard to find. You might not get along with someone else as well.