5.75 is on the average side, in the real world. But you could never convince a man of that so I will not try.
Surgery is not always the best option. It is risky and you could end up smaller then when you started. Most of the maintence after surgery looks like some of the excercises or devices you would use if you didnt get the surgery anyway.
Excersize and patience may help you get bigger in both areas. But it takes time. If you are that serious about getting your penis bigger, then it shouldnt be an issue for you. Take the time to educate yourself on PE in all areas. Read, read, read, and learn, then do.
If you have to spend money, talk to Big Al here. He can show you how to invest your money wisely in the subject of PE. He is totally legit and a good guy. I get nothing out of promoting him, other than I know he has helped me with my questions.