Red hear and well you can check out my gallery to see if I'm hung ;-)
THAT is something I can say, with my vast experience of cock on many continents, with many ages and situations, you have
NO need to worry about. You are well-hung. Really.
My worry has always been...are reds looked down upon as strange given the hair colour
?? May come as a surprise to you, but we dull and boring brown haired/brown eyed people are always worried about appearing dull. How many blonds dye their hair to brown versus how many browns dye to blond? Less than 10% and usually it's done for novelty, meaning they go back to being blond pretty quickly. Blonds DO have more fun. Reds are just the same.
Blond and red hair are two of the rarest, more remarkable colorations in the entirety of the human population. Brown is vastly more common than either. What you have is something striking and desirable because of that rarity. Blond appears to have developed as a survival trait. Blonds survived because they were desirable and hence, chosen more readily as mates. Reds got the same deal.
Don't ever think you're weird or looked-down on for your coloration. You have a rare and precious gene that adds that bit of spice (ginger maybe?) to the kaleidoscope of humanity.