Food hoarding

I feel so greedy, i hoard ALOT of food that i dont even eat. Unopened boxes of cereal,bags of sweets and food in general. I feel my reasoning for it is so selfish because the main reason i do it is because it hurts to see people (eg family) eat stuff that i adore but know i cant have so i steal food so no one else can have it and its with me just for it to lay in my room unopened. I do it KNOWING its pointless because it wont be eaten but i cant help myself, im so protective over it and dont want anyone else to eat it despite​​ me not eating it