No you're not the only person that's gone through this. If you work at a 9-5 and you're not doing this or focused on your friends / family / hobby or creative

No you're not the only person that's gone through this. If you work at a 9-5 and you're not doing this or focused on your friends / family / hobby or creative projects then maybe you're wasting the valuable little time you have on this earth. Big corporations exist precisely because they can afford the large inefficiencies that come from having a lot of people not really care much. Now as far as quitting your job, that depends on how much savings you have, your historical ability to deal with extreme chaos, stress and uncertainty, and how much you realistically believe you can grow the business. Some business are great part time but difficult to scale. Don't overthink it and just do what feels right. Remember that doing the wrong thing can end up being the right thing 10 years down the line.