Please help me doctor

Patient: HIdoctor i m 15 complete age but i masturbate once in one week but my stamina is so less .5-6 secs stamina i have of masturbatingand i have only 5 inch peniscan u give me advicehow to increase more stamina ????how to increase penis size ????please doctori m so worry about it …please doctor help mei am from India …

Doctor: