so confused and concern....

this is alittle tmi but my underarms always smelll... I dont even go anywhere... i do anything that will make me sweat.. its just always smellls even after i shower... i get annoyed because im very small person and dont even weigh that much... So idk why im stinky? lol😕 whats something i can do to prevent my oder... like i said , i dont work right now just go to college online at home..... 😮