You can always check if you still have yours with a flashlight and a mirror :-)
You have asked the questions under the heading "Losing your Virginity". That expression means different things to different people.
- Technically, you lose your virginity when you first have sexual intercourse; when a penis penetrates your vagina. You are thereafter no longer a virgin, whether or not your hymen is ruptured. Some hymens are tough or very elastic and do not rupture on first intercourse, especially if the penis is not large.
- Some people equate their hymen with their virginity, and some even call it their virginity. In cultures where virginity is especially valued, and sometimes even demanded, an intact hymen is considered evidence of virginity. Sometimes it has marital consequences.
To deal with the questions:
- "How do you know if your hymen is popped or not?" The hymen can be inspected visually. Hymens do vary in presentation, but many have a finger-sized perforation which allows the menstrual out-flow.
- "And will it hurt ...?" The tougher the hymen, the more it is likely to hurt when ruptured on first intercourse, but it does not necessarily hurt at all. Sometimes the hymen will rupture without pain. There may be pain on intercourse irrespective of the hymen's state. Tenseness, vaginismus, dryness, or just a small vagina can cause discomfort.
- "if so for how long?" That depends on the person and the cause. Very often there is a small amount of initial pain which soon dies down.
- "Do you bleed a lot?" Again that varies from person to person. A thin hymen is likely to bleed less than a thicker one. Also it may depend on the force of the penetration. Sometimes there is no perceptible bleeding. If the hymen has ruptured before first sex, then there is less likely to be any bleeding when first intercourse takes place.
What is particularly on your mind for you to ask the questions? Are there ant cultural or religious implications?
I hope this helps as a start, but if you want further clarification, or you want to ask more questions, please feel free to do so.