According to ancient yoga teachings. Your true identity is that you are an eternal spiritual being.
A person can kill the body but not the soul. However, you can kill yourself spiritually. This means you do not function as a spiritual being should function. I live a hedonistic life trying to find happiness by stimulating the senses and being engaged in different actions thus creating karma for myself. I have no spiritual activity in my life, so I feel dead and empty inside.
By hearing real yoga wisdom and following the process of meditation you will achieve your natural happy and joyful condition.