PLEASE HELP

I'm kind of scared because I was just "feeling around" inside of my vagina and I started to freak out because my finger went into another opening!!!! I kept feeling and there is literally a long band of skin vertically connected the inside of my vagina and it goes from my vaginal opening all the way to right in front of my cervix... I've heard of septate hymens but isnt that only the outside skin?? I'm so scared please help