Just a Vent :/

So, I have a little sister. And she can’t have gluten. So everyone thinks she’s “special”. Every subject we talk about, for example: I eat a small croissant. I talk with my dad about it, cause he doesn’t like it. Then my sister is like “Can you guys stop talking about it cause it’s not fun for me….” And then my dad thinks she’s sad. So I say: “ Not everything is about you!!” Cause I’m freaking tired about the fact that everything is about her because she can’t eat some sh*t. Then my dad gets mad. He says that “it’s mean” and that she can’t do anything about it. Just because im a depressed teenager everything I do is wrong. Maybe im selfish. Maybe. But is it wrong to think that they like her more because she has FREAKING ALL KINDS OF CANDY AND SHE CAN EAT IT WHENEVER SHE WANTS???