I’m Cumming quickly

Patient: Dear Doctor,I’m Rushenn and I’m 23 Years old Boy. Nowadays i have a problem. I usually doing handjobs. i’m doing more than 3 -4 handjobs per week. I’m cumming well. The problem is i’m cumming very quickly.When i see any porn videos online and when sexually feels i’m cumming very quickly. but that cum not like when i doing cumshots, its not too much and its like water.why this happens? please give me an answer.Thank you,Rushenn

Doctor: