we dont have control over everything, anything.

i keep a plant in room just to make my room feel lively. but recently, my plant show a dying symptom. i dont know what i did wrong. i watered my plant every day without miss. the leaves are yellowish now and some gets dry. i cant help but feeling sad. and angry. why is it dying?! why?!
i cannot control life. i dont have that kind of power. all i can do is trying to preserve it as long as it may be. just dont die now plant. it'll lonely when u r gone.