Im a teenage girl and I need help

emma

Like the title im just a girl who needs help. So recently me and my boyfriend have been experimenting and doing new things but whenever he fingers me theres something in my vagina that is obstructing him. I went home and tried it myself and i've felt it before. I don't know its just my hymen or if its cancer. Its not painful or anything its just a big lump maybe of tissue idk a couple cm entering my vagina.