Is this Romex ruined? Cut a hole on in-wall romex
I think you will be fine as it does not look like you damaged the actual conductor inside. Yes, the sheath is damaged; yes, the insulation on that one conductor is nicked, but I don't see any conductor wire exposed.

Look closely to ensure that the conductor is not damaged, than wrap it with good quality electrical tape and stop worrying about it.

If the conductor is damaged, you could use one of these fancy newfangled "in-wall" romex splices, rather than rewiring: