blockage in the vagina

Hi there...I'm asking you because there is nobody I can ask in Korea where I am.

HEre it goes:
> Hi there....here's an important question.
> My girlfriend and I were trying to have sex. I have quite a bit
> of experience. It was difficult. My penis was able too enter like
> about 3 inches I guess...but then there was some kind of blocking.
> This would be something other than the hymen wouldn't it? I never
> knew a hymen to be so hard. We really gave it a hard go.
> I'm pretty baffled and so is she. It's a pretty sensitive
> question.
>
> Sincerely,
>  
>