She might not be you, but she's a part of you, and the more you fear her or fight it, the more she's going to win out from the sound of it. You need to work to overcome your feelings and combine the two of you, maybe it will help with controlling the issue.
When you don't know what you're doing, especially with powers, people can get hurt. It's why you need to work on this other part of you and learning what you're capable of with the powers.