From the QRH.
Message: TAILSKID
Condition: The TAILSKID light illuminated indicates the tailskid position disagrees with landing gear lever position.
The message doesn't indicate that you've had a tailstrike just that the skid isn't where it should be.
The only indications of a tailstrike are reports, internal from the c/c or external from ATC. I doubt you'd notice it from the flight deck as it is well over 100ft away from the arse end.
Regards,
BH.