Can I do this with the mobile game?
 

Can I create myself as a fictional player and go through my career, retire and make myself a fictional manager?

I am not sure what the limitations of this game are.

No, that is not possible.

You could edit an existing player to be you but that´s it.

Thanks for the quick reply, that still might be workable.

There's a player editor so you can change the name, info and stats of any player in the game. So you can make yourself a player in the game if you wanted, but the retiring and making yourself a fictional manager would have to be up to your imagination.