Please, help me!
I had a game, breton, and i wanted to start another one with a khajiit, but when i saved the game, i overwritten it so i can't play my top game anymore!
Thank you

Are you on the console? Or have you never used Wyre Bash or made any attempts to backup your saves?

If so then yes, sorry to say, but it's gone forever.

Honestly, how hard is it to have multiple saves?

Are you on the PC ?? If so there is possibly a backup save (if you are using autosave) If you only saved the once there will be an autosave.bak file in your save folder (when the game autosaves the current save gets renamed to autosave.bak and the new save written to autosave.ess then once you save again the new autosave.ess gets renamed etc. so if you only autosaved once the backup file just needs to be renamed and should be useable (if you've saved multiple times then you may need to revert to an older save since the backup will only be a copy of the next to last save you made )

I take it you rely on autosaves. Never, ever do that.

Let that be a lesson for the future. Sorry.