You really need to speak to a councillor as your mum and dad are not here to listen to your problems.
It is important that you speak to someone right away as you are in a very dark place at the moment.
Life is definitely hard at times and it is difficult not to get depressed, but talking to people does help, it can unburdon your problems.
Http://www.Depressionforums.Org/
http://depression.About.Com/mpboards.Htm
above are some links to depression forums that I hope will help. You must speak to someone face to face though, it will help with the healing process.
Good luck
maggie