Google for images of the vulva.
"i m gttng married" - Congratulations. How old are you, and where are you from?
"the vagina opens inside" The vagina is the channel that connects the uterus (womb) to the exterior, so it actually opens outside.
"we girls have a small pipe like opening" girls have two openings: the vagina and the urethra (which connects the bladder to the exterior). But girls also have a clitoris (sensitive erectile tissue) which is the female equivalent of the male penis, and could be described as pipe-like.
- The vagina is the passage through which your menstrual flow exits your body.
- The urethra is the passage through which urine exits your body.
- The clitoris is only for pleasure, and nothing exits your body through it.
So what do you mean by "pipe-like"?
"Is that the area where the boy inserts his penis" The boy inserts his penis into the vagina. If he ejaculates, the sperm in his semen will try to swim into your uterus and to your fallopian tubes where it will wait to fertilise an egg if it is released in time.
"the boy inserts his penis to break the hymen" when the boy inserts his penis, the hymen will probably break. It may be that breaking the hymen is the particular aim shortly after you are married, but it is the place he should frequently insert his penis as an intimate expression of your commitment to and love for each other.
I hope this helps a bit more. If you want more help, please ask.