I am confined. I have been for all my life. All my life I have lived in this sphere I call home, although I have golden plates all over me. Sure, my warden ensures I have my needs fulfilled, but I am not going anywhere. Within my sphere, the only place I can really go to is my castle, although it of course of a small size. I explore it from time to time, but other than that, there isn't much I can do.
Who or what am I?