system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are most big businesses made into companies? Theoretically, If I have a lot of money, can't I just be the owner, president, CEO etc. without worrying people trying to kick me out of my company?

I've been following some stories of how some family-owned businesses have been taken away from the family that started them because the board members, stakeholders, shareholders, and whatnot didn't like them for some reason.
Is there any reason why I can't have a multinational company without having those 'pesky' people have a say if I get to keep the company? 
If I make enough money, can't I just hire people to do stuff and not have those controlling boardroom people having a say in everything?

I don't know if this is a valid example but I was also reading about how Vivendi is currently in the process of a hostile takeover of Ubisoft, a company owned by brothers. I understand that Ubisoft sold shares of their company but if I have a company, do I have to put my company out there? Can't I just have it to myself?

Understanding business is confusing... 

edit: Thanks for the explanations all. It seems like I'm too selfish to own a business lol. I DON' WANNA SHARE!!!
gpt
Yes you can keep your company to yourself. There is no requirement to 'go public' - meaning offer investors shares. The downside as others have pointed out, is this restricts your ability to grow the business based on capital. There's a way around this that's used by several companies, notably Newscorp among others. You issue non voting shares. These are shares that entitle the owner to a share of the company profits, but not a say in how the company is run. This lets you keep control, but you do need to share the profits.