Suggest Remedy To Increase Size And Strength Of Penis

Hi Dr. Aniruddha This is pankaj from india i have a problem with the size of my penis it is 4 inch when its erect . I,m 23 age Male . The problem is nowdays i do not mustrbute a lot . But i,m feeling like there is no power(strength) why is that ? What if i go to gym is it going to work in that way .... I have a GF but i,m virgin and i want to go for sexual ride - So what do you say i have to take a pill and if i have to which pill should i take so plz reply fast waiting eagerly ....