That's still a great time to be proud of. Stock 3rd gens are in the 15's and 16's.
Work on your reaction time, you would have a high 13 if you can get that down in the .500 area. A little advice, when you see the 3rd light come on go for it. Between your natural response time and the truck reacting you shouldn't red light it. If your wheels are spinning leave the TC on and avoid the water box in case you didn't last time. The water will still be in the grooves after a burnout and drip into your contact patch. Who were you up against that was a close race, good job