The beauty of penis

I have an average my 5″ penis when erect.i dont know but initially i was very curious to know about others penis sizes and i used to look at others when they are peeing in public.later on i started to look for penis images online and finally i noticed that i am getting errection when looking online penises and i enjoyed it lot. Truely speaking i am not a gay though i like to look for others penis pictures and i musturbate while looking to others penises.is it normal or i am gay?? Kindly help