Hi welcome to HCM.... You have habit of masturbation ...Over masturbation restricted ...as it can lead pre mature ejaculation... You also have problem in erection.... Rule out diabetes by random blood sugar estimation.... If you are obese loose weight .... Rule out prostate problem by per rectal examination get done .... Check your blood pressure to rule out hypertension... Avoid smoking and alcohol habit ... Main important one is avoid stress and be relax during sex .... Healthy diet taken with more fruits .... Do fore play more and regular exercise . You can take sex therapy session.... While urge to ejacule penis in middle can be squeezed for 30 second ... Serum testosterone and prolactine also checked.... You can consult psychiatrist with keeping this in mind ... Take care