CONGRATULATIONS!
You did a great job of getting a swim coach and practicing and then making it through the open water swim just fine.
The first tri is a learning experience for everyone... and you get to learn something new each time you do a new distance. Which is why this sport is so addicting! You reflect on your race and say, "I can do that better... next time I'll... xxxx."
So when is the next one?
Terrific job!
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"