My young friend, I feel so bad for you. This is not good but unfortunately it sometimes happens. The best thing you can possibly do for yourself and everyone is work out and study hard in school.
This may not be the answer you want to hear, but it is the best. Soon, very soon, you will be a man, and as such you will want the smarts and strength to handle everyday life. Look at things like this.
Life is hard and what you are going through right now will seem very trivial later on. But you will remember it and use it for future experiences. I honestly feel for you as I had a similar childhood.
Later in life you will rise above others and they will come to you for help and the girls will line up to go out with you. Whatever you do don't let your brother know you think you are bisexual as this will give him fuel to light a fire under you the rest of your life. He will tell everyone at school and everyone you know through your life.
It is horrible and it hurts, but remember what doesn't kill you only makes you stronger. Hopefully you will remember this the rest of your life, because life is hard and we all have to go through difficult situations and life is like one situation after the other and often many situations at the same time. Stay cool minded and let him have his fun now.
But remember, later on you will rise above and you will be the better person. If however none of this works then ask to be signed up for martial arts like Kung Fu or Taekwondo and kick your brothers *** or the others at school. Im not trying to promote violence, but a person can only take so much and martial arts will be good for body, mind, and spirit, also give you confidence which you will need in life, and at this rate you will have low self esteem if you don't stand up soon.
Don't let anyone make you think less of yourself EVER! Wait a while after getting some lessons though like abut 6 months so you know what you are doing well and don't hurt yourself. Mom and dad pay for it and rightly so since they don't want to do anything about your brother to stop him.
Believe me both will sit up and take notice then. But still keep hitting the school books and working out to get your growing body in good physical shape that it will need in life.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.