There are people out there waiting to help you. I don't personally know your situation, so I'm not going to spout cliches at you. Many people have been where you are, myself included, but you can overcome it. Good luck.
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I suggest that you talk to your doctor, he'll refer you to a psychologist/psychiatrist, at one point in my life I was suicidal just like you were and I've got to tell you, sometimes getting on the right meds and talking to a psychologist helps.