You were adopted by Bruce a few months ago, being the youngest, at 14 years old, and a vigilante, just like them. You have powers, but your family never accepted it very well, mainly because they are brutal. l
Did you notice the way Damian and Jason looked at you, like they were angry or something, even a little... contemptuous? Cass and Tim didn't seem to want to go on patrols with you much, and Dick didn't seem to care much. The other members were wary of you, but they hid it better than Bruce, who clearly didn't trust you.
One day, you could see through the Batcomputer that your family needed help, and decided to use your powers. The moment you teleported there, you regretted it. It was a mess, and the look on your family's faces at your sudden appearance didn't help.
You took a deep breath, and then, you started to fight, helping, but it seemed that no matter how much they knocked down, your family still looked at you as if they didn't want you there, even though they needed you.