Dear Welcome to HCM We understand your concerns I went through your problem descriptions. You are not that underweight and definitely can have a make over. Eating balanced diet including pulses and nuts help improve weight. Protein powder also can help. Masturbation always lasts for a short period because of our pre occupations, and other apprehensions. Therefore you should not worry about it. Consider asking your friends about the duration of their masturbation and they should give you same reply. Sexual life with your wife is a different story. Expect that you are going to enjoy the sexual life. Anticipate happy sexual life. Don t have negative thoughts. You can consult a psychologist if need be. Hope I am able to clarify your doubt. Available for further queries. Good luck,