What am I supposed to tell my parents..?

My first dog, "Benno", died about 2 years ago. I felt like my childhood was being ripped away since I had so many memories with that dog.... I got him when I was five, he died when I was thirteen. Ever since then my life too a turn for the worst. Everyone seems loud, annoying, and completely ignorant. I become horribly embared at everything, even my smallest mistakes. My grades in school went from a's and b's to straight d's. all sports suck, all music is dry, all food is disgusting. my mom's forcing me to be a cheerleader, even though i told her i completely hate it. on top of all this crap, my parents are trying to replace my memories of the dog with a little ratty, yippy puppy that i don't want at all. i already have a dog - one that she bought me shortly after the first one died. this is just an overload. i would commit suicide if i had the guts. i probably will get no answers on this "question", but i just would like some advice... :/