I just found my little sister's self-harm tumblr.

I'm shaking. She's only 14, a middle schooler. I love her so much and I can't believe this is happening. We tell each other everything.

She's my best friend in the whole world.

Posts about cutting, suicide, depression...I found it by accident and now they're haunting me.

I don't know what to do. Tell my parents, confront her...has anyone experienced something like this? I need help. She needs help. I have no idea why to do and I'm about to loose it.