I am a stockholder in a small Corporation. What rights do I have if the company is not registered on the stock exchange?

The board of directors refuse to allow me to attend any meeting they have plus when I ask to see the minutes. They will not allow me to see anything
until it is approved at their next meeting.Which could sometimes be 3 to 6 months. When they finally sent the minutes they took a black marker and marked through whatever information they wanted. I requested a clean copy and they refused. I am one of only 6 people who attend the stockholders meeting. the remaining people are all family. I only own 52 shares and have been told basically to shut up. This last go round they gave themselves 150% raises. Then they gave a 10% raise to an employee plus company stock but told the stockholders the company stock was given rather than salaries or bonuses when they already gave both. Please help