Depressed..plese help?

i dint know what kind of person i am.. (actually even if i know.. the behaviour of the people make me think twice thrice n ...millions of time that WHAT KIND OF PERSON I SHOUlD BE.. so that people start liking me too.. where ever i go people tart with a good behaviour and once they know me.. they start ignoring me.. i am surprised what is so annoying in me.. that People start hating and ignoring me.. they dint even like to talk to me.. I have tried everything to make people happy.. i have worked like servants for them so that they start liking me.. but all worthless.. i have no friends.. no one like to b my friend.. sometimes i think i should suicide. i have spoiled my career by getting the answer of these questions. I have done engineering. with poor marks.. it not that i am not good in studies but it is because of the above reason .. that i always tried to explorer what kind of person i should me so that people make friendship with me.. its almost more then one year that i have no job.. i am from a poor family.. there's r lots of responsibility on me.. my younger brothers have left there studies because of financial problems. that is the reason that when i think of suicide.. the other side i see the face full of sorrow on my family and had to drop that idea.. please if anyone has some suggestions.. please tell me what should i do.. should i suicide? (please say yes)