Re: Self-concious.. More important: Girth? Length? The right combo?
Having the girth of a tampon would probably not be enjoyable for most women. I think this size would easily hit the cervix and, being so small in diameter, would be painful. There has to be some reasonable range of length and girth that is ideal, though what is idea for one woman may be quite different for another.
You are a bit over average in length and a bit under average in girth, but I would think you are at a very good size overall -- no woman should find you either painful or too small to get them off, or to engage in most positions.