At some point an inflated sense of experience is necessary to succeed in starting your own company. You have to literally believe you are capable of having a real impact. Jeff Bezos, Elon Musk, Bill Gates, etc. All were told at one point "you don't have the necessary experience for that." Or "are you fucking crazy?" Or something meant to challenge their experience. The hard realization is that none of them had the experience...but boy did they sure earn it.
Point is: arrogance isn't the curse you might think it is.
There are a handful of sociopathic people who reach those heights, while most of the rest do not. Mistaking arrogance for an active ingredient in success is probably a mistake likely to lead you down a bad road. Ruthlessness, arrogance, greed might be things you need to be a high level founder, banker, CEO or politician, but most people with those traits are abject failures. You need to be smart, and very lucky as well, and even without arrogance smart and lucky should pay off.
Point is: arrogance isn't the curse you might think it is.