Is it normal that i feel sad over things that shouldn't matter?

Lately a lot of really small things have been starting to make me really sad. When I have to throw away food there's like something in my head that tells me that what I'm doing is wrong, and some starving child could have eaten that. Or when I give a stuffed animal to a dog, I get sad because I feel like that stuffy has feelings and it's being hurt by the dog, or that it feels lonely, like taken away from its family. It happens with almost everything that normally people would be fine with doing. Dropping something on the floor, throwing out food,the constant feeling like I'm "hurting" an inanimate object. Is this normal???