If you're just not into gaming anymore, then you shouldn't be worried about what happens to your account here. Just don't log in and it'll be lost to the sands of time.
If you're worried about someone in the future linking your account to your person, then that's more problematic...but unless something has changed since I was on the team, there's no easy option to just delete your entire account...only to delete your individual posts.
But hey, 1916 posts isn't too bad. You can delete one post in about 20 seconds, so that works out to be almost 11 hours. Just get a few Red Bulls and get it done in one sitting!
NNID: Zephyr25 / PSN: Zephyr--25 / Switch: SW-4450-3680-7334