3: Don't they know their parents love them ??
They do know their love ten . But the pain they have its to strong. Makes them wanna give up.

2: Do they think that's the answer to all they're problems?
“I feel like suicide is the only option I have left, the only chance at peace I’ll ever have. It’s as if something will always be missing and life will never be quite right.” 

1:  why do teens commit suicide?
Teens commit suicide because .. they are:(in)

pain

loneliness

rejection

abuse

deep sadness

guilt

depression

helplessness 

Q1: Why do teens commit suicide?
Q2: Do they think that's the answer to all they're problems?
Q3: Don't they know that they're parents love them?
Q4: Were they really that depressed/sad?
Q5: How did they have the strength to commit suicide ?