I dont know

I have this feeling inside me and I don't know how to explain it. I just feel so empty and sad. I don't have the brainpower to do my homework all i wanna do is sit and do nothing. I feel like crap all the time like im just drifing through school like nothing matters. Like I want to scream and yell and break things and then just cry. Eating is hard for me, I get so nauseas looking at food or even just thinking about it. Everyone always sees me as the happiest in the room. Im the most confident and positive. I cant be pessimistic. My mom says that im fearless and I wanna believe it, but deep down I know im not. Im the one who always gives my friends advice, but i cant seem to take it myself. Sorry to sound dramatic and all of this is probably stupid.