I know when your a teen it's probably the most confusing time of your life......Not a kid anymore but not quite an adult. Teens tend to worry about everything and emotions run wild.....Been there done that....
...Not dismissing the fact that there may be a true dx or label, to put your mind at ease......But schizophrenia?Highly unlikely.....Schizophrenics are often unaware that they have it.....They believe that others have the problem....And many times have a dual dx, like paranoia.....Which gives them delusions....And makes them believe others are out to get them. Just the fact that you are able to post this tells me you couldn't possibly be schizophrenic.
I'm not saying there's nothing wrong or that your a perfectly normal teen....But saying you have an active imagination and your a loner does not qualify for a dx.....Alot of teens are this way.
Maybe inaddition to the social anxiety you could be described as anti social?Do you want to be around other people?Or do you chose not to?
Just winging it here....But you could also be dxed as aspergers(a form of autism)......Many do not get dxed until later in life, when their lack of social abilities become more pronounced........Honestly unless you become more specific, it could be any of a number of things........
......Or just being a teen. :)