Lol as you said we are over 14 years old so we know well how it feels well but it's upto how you deal with it, you can complain about it like you are doing now, or you can just not care less or maybr you can do something different to make a difference in your life lol i know you are just 11 but It's better if you start from now and think about how you will deal with your life Good luck
What you do is refill in front of all your teammates if they kill you know who isn't a true teammate and who is. If they gank you then I usually just take the deaths and ignore it, but in some cases log off, then get online target them one by one when they have no teammates on. I do the same thing to frxq who keeps running away from me now, after I kept targeting him ever time, eventually the same people who ganked you will want to team with you in some cases I team with them, some cases I don't.