Suggest Remedy For Erectile Dysfunction

I am newwly married. I have bad habit like smoking, drinking & mastrubating since 20 years. As I am newly married & when tried to intercourse with my wife the errection is for only 5-10 min. I can not ejelicate. my penis get pain after some time. I never intercourse before my marriage. My wife want baby in year. I got depressed now as I can not fully intercourse since one month. I can ejelicate while mastributing. Kindly help me on how can I stay erected atleast ejection level.