Lately I've been feeling kinda sick of life.
I'm sorry to hear that. Why have you been feeling sick of life?
I'm bored and I think it is time for me to head on my own path.
It seems like you might be a little bit overwhelmed. It is okay, we all feel like that sometimes. The important thing is that you do not give up!
I just want to be happy. I'm tired of working and making myself unhappy.
Constantly working and being unhappy isn't a good combination, and can definitely lead to feeling overwhelmed. I think you should reconsider what you value in life, and make some changes if necessary.