Why can't I insert a tampon?

I'm almost 15 years old, I've had my period since I was 13 and I still cannot insert a tampon. I've tried light plastic tampax and i've tried KY Jelly. I know that its going in the right place because at one time my mom tried to help me insert one, but it was too painful. I have been trying for... show more I'm almost 15 years old, I've had my period since I was 13 and I still cannot insert a tampon. I've tried light plastic tampax and i've tried KY Jelly. I know that its going in the right place because at one time my mom tried to help me insert one, but it was too painful. I have been trying for almost two years! I'm thinking I need to see a doctor, any advice? Oh and I'm pretty sure its not because I'm too stressed because I wasn't nervous at all the first 7 or so months but I feel really stupid because all of my friends can use them and I can't. I think my vagina is just too small.
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