"My heart has been shattered,
little does anyone know though.
Especially my youngest sister."

-This gives me a clue to what you are going to talk about. I can feel emotion here.

"At age fourteen, incredibly young,
having sex, she thinks it's fun.
Why? Does she not know the consequences?"

-The rhyming here is too simple for me, but you get the point across about what you are saying.

"Is there anything I can do?
Anything I could possibly say?
Will she continue on this way?"

-I can feel here that you are struggling with this, and struggling with what to do. I feel though that maybe you could have gone more into depth.

"My eyes start to water,,,
I'm about to give up hope.
I have failed so miserably."

-I can picture this happening to you, and the guilt that yuou might be feeling.

"I'm at a loss, what do I do?
It hurts me so much inside,
Does she even have a clue?"

-Here is where I can tell that your sister does not know of your feelings

"My heart is shattered and broken..
I'm so hurt and confused.
Will she continue living in this sin?"

-Hurt is used a lot in this poem, and I think that it could've been used less, but you get the point across of how much pain your feeling over what your sister is doing. I like how you wrap up the end. You leave the reader with a question, and that makes the reader wonder.

Good poem. I liked it because it was to the point. The wording was a little bit simple for me, and the rhyming was good,but not the greatest. Yet I could feel your emotion coming out throughout the poem. Keep on writing.
4/5