During the long depression, I almost never felt happy or had any really strong positive emotions. So...
...I almost forgot that when I feel happy and don't hide it, a huuuuge part of people, who don't know me yet, start to perceive me like an idiot. ¯_(ツ)_/¯
The problem is: when I'm happy, I'm talking about everything with excited voice, admiring things around. Like "Oooh! This colorful disposable cup is so nice! Thank you for giving me it!" or "Look, look this piece of junk looks like a kitten, if you look at it from that angle!..". Of course, I also click fingers, clap or make another excited gestures, bouncing around.
And seeing this, some part of people start to look at me strangely, stepping aside or trying to calm me down, using baby talk, or just generally patronizing me.
Sometimes, when I notice that kind of reaction, I don't mind and just try to behave less loudly. But sometimes it makes me to return to default regime of "gloomy sarcastic girl with dissatisfied almost expressionless face". This regime starts with turning smile into smirk and answering sarcastically to the last one who tried to talk with me like with a kid or fool. Then continue any further talk with exceptionally serious voice, talking either sarcastically or in a businesslike manner. This transformation completely confuses people; yet they, at least, start to take me a bit more serious.
Do they really like serious, sarcastic or arrogant me more, than merry me?