Never use word hate, use dislike.
You should feel proud of it and that one day they will respect you.
It is a fact that you are elder which cannot be change.
When your parents are alive they can look after them.
You are just a child of 12 year do not feel burden.
It is blessing of Allah Pak that you have sibling, not alone and play with them tell them jokes, stories and make fun.
You are not as big that you cannot make fun.