It's hard to tell if it's cool without any context.
For example, adding some of these might help:
What track was it?
What weather and time?
What tune did you use?
What assists?
What controller did you use?
How long did you practice for it? How many attempts did it take?
How does it compare to others?
Is there any video of it?
What was your goal (if any)?
How would you describe your experience while doing the lap?
If you want to compete with others, try time trial. You'll have the same rules as everyone else so you'll know if you are good or not. As for your time, you took a track where wall riding is possible so without seeing the lap, I would say no It's not.
Once you've exited the track and are back on the time trial menu, there's a "Replay" button where you have various options, you can save the replay of the best lap and share it, it will be available to everyone in game.
If you want to share it on Youtube, it is a bit more complicated but not difficult.
