Hi Chennai queen,
Like you I have wondered many times 'Why do I bother to live', for example I have lost 3 important people From my life to death in the last 6 months. One of them was an 11 year old disabled girl and she taught me more than people would ever know, The main thing she taught me (bearing in mind she couldn't walk, talk or feed herself, in fact she couldn't do anything for herself), was to 'LIVE DEEP' live every day as if it was your last, make the most of what you have and be happy, even when things are hard and you really can't face another day, just stop, take a deep breath, and say to yourself "I'm lucky to be alive", and IF you believe it then things will start looking brighter, I'm not saying all will be right with the world because it probably won't, but it will start looking better.
I really hope this has helped as although you may feel that your family are unhappy that your here, believe me they will miss you when your gone.
Good luck and hope your live soon feels a bit happier for you.
Love Lee xx