Hello raingal,
Yes life can be depressing at times, I been through that stage, and
seriously its no joke. I might be a few yrs younger than u, but i
can frankly tell you that i been through much more depressing stage
as well. Maybe sharing of life experiences helps. Btw, you already
took the 1st step out, that is to let others help u. I just hope my
advise do helps a little.
Since you already realise yr problem, that is you dun do anything
now, yr future will be forever miserable or depressing. Also, i see
taht u realise that you should get a job too, but mind if i ask why
don't you do so? I mean, at least a job provides you with the basic
needs, it takes up most of yr times so you don't have much time
pondering over other things. And yes, no nee dto envy yr friends,
they work for it, you can too. Just start now, maybe you'll be
some1 also in 5 yrs times, no1 knows what gonna happen. Its never
too late unless u dun try. May i know what's yr reason for not
wanting to work? Do you know that there are actually many pple ard
who wants a job now but can't get cos of economy downfall. So 1st
of all, I believe you should get a job as it will take a part of yr
depression away.
Yup, its natural that yr parents will be upset. I mean, who
wouldn't, when they see their own children can't get alone. Dunnoe
if u see the point, if you start working, the immediate benefits u
get is as below:
1)you will spend less time at home, then less time for conflict
with brother (i presume u all live together)
2)your parent will worry one thing less for you.
3)maybe you will meet yr Mr. Right at yr new workplace
who knows? even if no mr. right, sure will make some
more friends who can listen to u, live!
4)your current lifestyle will make a U-turn for sure
And yah, actually do u realise u know yr own problems well but u r
just grumbling abt them and not doing anything. If you dunnoe yr
problem, then its very hard to tackle it, but since you know yr
problems quite well, i guess u can start taking some actions.
Oh yah, also, dun just drink water, you will only end up getting
gastrics!!! then will have to spend more money to see doctor only
or buy medicines. At least have yr basic meals or at least grab a
bite! Then u wun end up so miserable. i dun have gastric but seen
b4 friends who have....... ermmmmm very jia lat one i must
say.
I wished i can help more, but guess all i can do is advise you.
Yes, you are down, but you are not out yet. U took the 1st step
forward, now is the time for 2nd. Oh yah, just in case u really
start looking for a job, ermmmm dun be disheartened if got reject
cos now not easy to find one, but at least try 
Really wishing you all the best! Do update us how r u getting on
every now and then okie? 
Regards
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nOthiNg iS ImpOsSibLE In tHiS wOrLd
EvEn tHe wOrD ImPoSsiBLe SaYs "i'M pOsSiBLe"