Hi, I Have One Query Regarding My Penis, Maine Meri

Hi,
I have one Query Regarding my penis, maine meri girlfriend ke sath sex kar raha tha tab foreplay me usne mere penis ka skin back kiya mera penis full erect tha to penis getting pain full for me, badh me main real sex karne ja raha tha to ja nahi raha under because uska hardness kab hiva aur main halka bhi nahi huva
uske badh 2 day ke baad dekha to penis ke uper ka skin stretch aaye the main dar gaya penis ke front side me chote pimples dikhe red color me wo bhot iches kar rahe the aur mera skin piche raheke suja huva hai main kya karu jula gel lagaya hai alovera ka gel hai friend ne bataya but still scared because of my sexual life in future please tell me how to erect long and what going on my penis skin???