So i have some GOG games on Steam i thought that i could transfer them from Steam to GOG,
Its probably impossible but if there is a way can someone guide me please?

Not possible unless it's The Witcher or they run a publisher deal with Steam Connect, which is currently not doing any such deal.

For The Witcher 1 and 2 go here:
https://www.gog.com/witcher/backup

For GOG Connect go here:
https://www.gog.com/connect

Unfortunately there are no games available to transfer from Steam at the moment, like CARRiON.FLOWERS said. GOG plans to add new titles, but every transfer offer will only be temporary, so check the site once in a while to avoid missing a chance.

There's also the opportunity to reclaim a few boxed versions of games. The participating titles can be found here:
https://www.gog.com/reclaim

It's worth nothing that this also works with some games bought digitally. From what I recall I managed to redeem my Steam keys of Shadow of Chernobyl and Call of Pripyat on GOG.