Just to add to Glitter's advice:
have you checked out our article Pink Parts – Female Sexual Anatomy yet? If not, I bet it would helps. It's a road map to exploring your genitals.
There a two things that might be to blame on your impression that your vagina is too small.
Some women have trouble inserting fingers or tampons because they have a resilient hymen that makes the vaginal opening appear small. However, as you can use tampons though, i doubt you'd have much too worry about here hymen wise.
Is it because you can't insert a finger or had the feeling that you "reached the end" of the vagain really quickly when inserting a finger?
Thing is, the vagina is not a straight "tube", but has an angle (you need to push up and towards your belly at the same time), and hence it's easy to get the impression that something can' be inserted. A Lack of lubrication can contribute to the feeling that you can't insert anything.
Like I said, the fact you can use tampons successfully seems to indicate that nothing is wrong with your vagina here at all. the vagina is not terribly long in the first place: the front wall of the vagina is about two and a half inches long, while the back wall is about three inches.
Also, keep in mind that the vagina is a flexible muscular tunnel that can adapt and stretch to accomodate anything from a tampon or finger to a penis and (afte a lot of stretchign) even a baby's head during birth.
Normally, the walls of the vagian are relaxed and collapsed together, whereas during sexual arousal, the inner two thirds (the upper part) of your vagina expands.
"Through repetition the magic will be forced to rise."
[This message has been edited by Alaska (edited 06-11-2002).]