Am a failure in life. What should i do?

am a married guy of 24, i did my btech 3 years before and i dint passed in it and still i dont have any job. I had an affair when i was studyng, my family accepted it, but later i had a feeling not to marry (after completing my college). i told many times to her to leave me. but she dint. if she go, i get a chance to write my btech papers back. But a married person should go for a job first ryt. I tried for a job. I dint get. recently we got married. i have a feeling nw dat she destroyed my life. i dunt love her now. i feel like killing myself,sometimes others. i like to die now more than living with this life. but dying is sin in our religion.so am not gng for it. but i want to get rid of this situaton. its been 3 years after completing college and i dunt have a job now. really frustrating. and i dont want a life with her. what she did to me,is like she is very selfish. she dint think of my situation den. my behaviour changed. i alwys gets angry to evryone. really a ******* life.