What could I do to make me happier?

I am doing online schooling and am on grounding for being expelled, I am not looking for any sympathy, I know what I have done wrong, and I refuse to believe I am depressed or anything. But I am not allowed to have any pets (Trust me I have tried.) or see my friends (Tried that too.) So is there anything I could get to have with me in my room to lighten the mood, make me feel a little happier? I wanted to get a delicate little plant of some sort like a flower because they are pretty and they need you to nurture them but they get bigger and bigger and if not, die. That wouldn't lighten my mood at all. Bamboo isn't comforting and neither are just regular shrubs. I am tired of crying and feeling like this. Please, Ideas? To help these long months ahead? Thnx.