How can i get my sister to stop stressing me out?

My sister is such a hypocrite and my parents don't listen to anything I say. When I am sad my sis follows me making me feel even more like shit. I don't know what to do. It has been this way for a long time and I don't know what to do. I feel like a bomb...

about to explode!

My god, I know exactly what you mean! What I do is try to ignore her whenever she acts that way, that way you'll avoid getting in trouble. But if it's to the point where you don't care if you get in trouble or not, then next time she does it just yell Shut up! I'm sooo sick of your crap and I think you need to stop alright! Usually that works, but if not, Funmail me!

What you should do is talk to her and let her know how you feel. Do this calmly and without too much irritation, this way, she wont get defensive.