I want to fuck my little brother

For reference we have a 8 year age gap. I'm 21 and he is 13. I know how fucked up that sounds and I knew this was just too weird to share with anyone. I'm just venting. I'm not even into young boys or anything...I've never thought about fucking a 13 year old.... But there's just something about him. I know how wrong this is and I know it's never going to happen.... But I just can't help but think about it. I just wish this wasn't what I desired so bad.