I have an enemy in my house.

I’m a 17F and I still live under my parents roof. I go to school, I do sports, I have friends, my whole life was pretty average until yesterday. I woke up with a huge wound on the left part of my stomach. My shirt was stuck to the wound because of the dried blood, and when I saw it I immediately panicked. I didn’t tell my parents or siblings, I just wrapped a bandage around my stomach and I pray for it to not get infected. But here’s the thing : Who did that to me? I don’t speak to my family since yesterday, I’m really scared rn. I can’t help but think that the wound has been made by a knife? Anyways I’m sorry if that’s not fun but I would like an advice on my shitty situation.