How To Increase Weight And Manage Premature Ejaculation?

Hello sir i am very lean because i masturbates in my small age onwards now i am 20,because of that in night my sperm is automatically releasing in night, now how to stop it,and how to became fat now,and i also having a lover i am going to marry her with in 4years,so my sperm is releasing quickly how to make it long now i afraid that how to sleep with her if i sleep with her may know that my sperm is releasing quickly by the chance she may hate me also,so please help me doctor....