Hey,
I read this a while ago but I seem to have lost it

I think it was pre-series, it starts off with a group of men kidnapping Sam from his motel room, they take him some place and ultimately rough him up a lot. Somehow he breaks free and finds his way back to the motel where Dean finds him. The entire things turns out to be a set up by John who wanted to use it as a kind of test.

There's something about Dean and Sam leaving John (I think?) and Sam really struggling to trust people again - he starts a fight in school just because a guy touches him.

I hope someone recognises a fic along these lines. Thanks!