I resent my mother and brother. Do I really have to be around them?
Oh my goodness, do you think you can let go of that? What are they doing to cause the resentment?
I can't stand them both. They're always having fun without me.
You should ask to be included, then. Let them know you're feeling left out.
I won't ask them to include me, they'd probably tell me no anyways. It is rather depressing.
Evenstill, you need to tell people that you have feelings too. One day they will realize what they did to you was wrong. I hope it is sooner than later for your sake.