just please help me end it

i got everything ready, but i just cannot bring myself to finally kill myself. there is nothing to live for, i'm a failure and an utter dissapointment to everyone. sure it will be hard on everyone, but they'll get over quick. im such a coward I can't even finish the job, I'm scared I'd survive or get a call. just please give me courage, advice, i'm scared, i hate feeling like this.