do you think I should yell at a 14-year-old?
What do you want to yell at a 14 year old for? It doesn't seem like something you would do.
Because I'm pissed off my parents spoiled him too much, I always got the blame for him.
It's frustrating to be blamed for someone else's behavior, but you should be patient with him. He is still a child, and approaching him with patience is the best way to teach him.
Dude shut up I'm going to yell at him even if I'm the one that has to take the blame.
The problem isn't your sibling, I think. The problem lies with your parents, so I think you should talk to your parents about how you feel and maybe they will start treating you both fairly. It's not really your 14-year-old sibling's fault if your parents are playing favorites, right?