The Legendary Janitor
Most people don't choose reincarnation. Reincarnation finds their way to them. Perhaps they did something great in their life. Or maybe truck-sama wasn't looking where it was going. But without fail, those who reincarnate are destined for something great. A new life where everything changes for the better. But... Reincarnation isn't always the greatest thing. Sometimes you just draw the short end of the stick. Di Tou just happens to have drawn the shortest stick. Pulled out of his life randomly. Taken by a crazy old eccentric man not as a disciple, but as a body double?! And a janitor body double no less?! Grasping a system to find... It's a JANITOR SYSTEM!? Truly, how unlucky can one get?
A Spike
The act of deceiving oneself based off the way that others treated us wasn't really anything wrong, and it was a very common human behavior. It didn't help that many people were born with an innate sense of imposter syndrome, feeling like they were a fraud at things they were very much good at. With this feeling being associated with things we were talented at, it only got worse with things we really weren't good at. Thus, as humans it was typical to try to gauge ourselves based off the reactions of those around us.
If nothing went wrong then… it should be good enough?