"I hate my life" is usually meant to be a speech filler; it holds no significant value to a conversation or situation. It is probable that the female is trying to seek attention after mis-performing or failing some task, however, little sympathy is provided by the surrounding population.
Some proper responses to the phrase are the following: "Aww," "Uh oh," and "What happened?" It is disrespectful to reply with the following: "I hate your life, too," "Hahaha, you suck," and "Oh, you fail."
Steph: Ahh, I hate my life.
Joanne loses in Tetris
Joanne: Oh my god... I hate my life...
Used to express disapproval, disgust, or if something bad happens to oneself.
Friend 2: "I hate my life!"
Person: " 'I love my life'....everyone is saying that now!"
Friend: "I hate my life"
You: ::spilling hot cocoa all over yourself:: " I HATE MY LIFE!"
Person 1: we have a huge bio test tomorrow
Person 2: Not uh really?
Person 1: yea!
Person 2: uhhg i hate my life