Why're you sad? You're one of the funniest people on here if it wasn't for you, Egypt, blind, panda, legend, sorrows♥ (there are more), I wouldn't be on here. I don't remember usernames that well ('-w-)/ I've forgotten mine a few times
It's probably hormones. Hormones are the reason for everything. It's really common among teens, because it's the age where hormones are constantly fluctuating and battling one another. It also happens a lot to girls around that certain time of mês regardless of age for similar reasons. Unless it's something that persists with intensifying negativity, I wouldn't worry about it too much.