nebeska,
Finding out my life was been one big lie was completely devastating. I woke one morning and realized that my life had been wasted on this garbage. I cried for days. Once I pulled it together enough to drive into work it was crazy. Nothing seemed real. I begin to wonder what was the point of life at all and on several occassions considered just ending it all.
Then a thought popped into my head, "Why should I die because some people that I don't even know lied to someone that lied to someone else that eventually lied to my mother who passed the lie on to me?"
Seek out a therapist. If you're not comfortable with that, talk to someone, anyone. I know when I called Flipper, he probably thought I was crazy or mentally unstable but having him actually listen to my story did wonders for me. If you are not able to talk to anyone, write it out. Grab a pen and paper and just write everything you feel completely unfiltered. Give yourself a day or two and then go back and read it. You'll see that you are angry that you've been told a lie and not wanting to kill yourself over a lie from people that you don't even know.
There's a lot of living to do, don't let them rob you of it.