My minecraft account only lets me play demo?

I played on servers with my home boys and i stopped playing for a few weeks now i can only play demo and my home boys are crying. I don't know how to get in my email either so you know i'm only 13.

Are you premium? You know you have to buy the game.

What device are you on? It could be that you have to full version and demo downloaded and you just keep clicking on the demo one on accident. I did that and after figuring it out I felt really stupid