I literally get sick to my stomach when I go into work
Why would going to work make you sick?
Because people there are so dull and I have to be the one who keeps the mood up.
It's okay to not like your place of work. You should just try to make the best of it.
What's the point of even trying? People are one-dimensional.
People at work can often be boring, and it's fine to not want to be around them. But you still should give them a chance.