Part of the contract you made when you bought your shares is something called "drag along". This means that a small minority of shareholders who don't want to sell, can be forced to sell. There are specific, well defined cases where this applies. A total buyout is such a case.

Most small shareholders of public companies are not even aware of the details of shareholder rights ,voting, board control, acquisition, etc, because it almost never matters to them. But your rights have various standard limitations, and in a buyout, merger, bankruptcy, etc. those limitations are important.