Shut off the television, avoid movies, and ignore social media. Feminists are into this penis size thing because men have concentrated on boob size for ages. Flat chested women are pee-o'd about that stuff. I don't know two men that don't think that their penis are big enough. It's human nature I guess. Find something else to dwell on. You sound very average, btw.
The average size according to different studies I have read is around 4.8 to 5.2 inches. So you should be good enough.