Hi,
Not all hymens look the same, and over time the appearance of your hymen will probably change. When the hymen stretches or becomes ruptured (broken), usually it will look like a very small opening at the entrance of the vagina, which is normal. In western cultures, a virgin is considered to be a person who hasn't experienced sexual intercourse... Once your hymen stretches, it will loosen up a bit, but it won't be a noticeable change unless you're sexually active on a regular basis. I hope this helped answer a few of your questions ~ Take Care :)