What size category is this in?

Perfectly normal, erect actually a bit larger. Those are called "growers, not showers"

Average I suppose. A 6" erect cock is a good size: my cock is about 4" flaccid, 6" erect and about 4" in girth. I consider my cock to be average but everyone who's seen my cock (male or female) on cam or in the flesh has been impressed: one guy even called my cock a monster after seeing it on cam, be proud of your cock it sounds like you've got a good one, very suckable

Average. When you get older don't be surprised when cold weather turns it from an outie to an innie! Turtle mode, I call it.

Average but good enough for any woman. But if you want to add a few fractional inches then massage it with olive oil for 20-30 mnts everyday for several months and see if it works!

I would say average to large. I am about 4 1/2

The average male penis is 6 inches erect.