Starting a company is really going to define you as a person. It forces a lot of hard decisions on you that get baked into your personality. The ups and downs

Starting a company is really going to define you as a person. It forces a lot of hard decisions on you that get baked into your personality. The ups and downs are either euphoric and horrific. If things go poorly you will deal with self doubt and heartbreak on a very deep level. Even if things go well you may end up developing negative personality traits (hubris, callousness, aggression) that lead to loneliness. My recommendation is to find a project idea that compels you, and at least one other bright and capable person that will help ground you. Most successful companies I've seen have started this way.