My cat is really horrible.
Why do you think that your cat is horrible?
My cat is just really boring and I feel like it is completely unable to ever communicate with me.
You're thinking too much about your cat. You should stop feeling horrible for your cat being what it is.
That cat is just so useless and I feel like it's my pet for no good reason.
You should not dislike your pet like this. If you truly do not like your cat, maybe giving it away to someone who would value it more would be a good idea.