I agree with lonelymom.
Don't be paranoid about what God gave you. Bigger is NOT better all the time. Trust two women who've had experience with this issue. :)
You shouldn't worry about the size. Believe me as long as you are pleasing your woman and you can do it with any size than that is all that matters. Learn to enjoy what you got and learn how to use it to please her.
I have had large men and small men and I can tell you from experience that the small men were ten times better.