I keep accidentally breaking stuff in this office
Why do you keep breaking things in this office?
I'm confused as to what I am doing here, I'm not used to working in an office.
I'm sorry that you are feeling that way. You should try and ask for help. Ask your boss about the guidelines and rules as to what you should be doing.
I think I'm going to stop showing up here.
I don't think you need to leave your job. It is wrong to be careless and break things, but asking for help isn't wrong. You should just try and find your job description.