For a girl it is a little more complicated. Unlike a boy a girl cannot just drop her pants and have intercourse. She needs foreplay. She needs to be comfortable and she needs to feel safe in her surroundings. Remove any of these three things and the boy will get off and she probably will not.
What I suggest is that you first find out if you can orgasm. To do so I suggest you go in your bedroom, lock the door, undress and make love to yourself. Call it self-foreplay or masturbation if you want. There is no sin in masturbation it is after all nothing more than foreplay and according to a recent survey 85 percent of us do it. Most religions condone masturbation including the Catholic church.
If you can relax in your own room and bring yourself to orgasm then there's nothing wrong with you. What you will find out is if you are clitoral or vaginal in nature. If you can orgasm by stimulating your clitoris then what you need to do is get your boy friend to stimulate your clitoris during foreplay and to find positions that allow for greater stimulation of your clitoris during intercourse.
You may also find that you need to spend more time on foreplay before actually having intercourse. Boys (ages from 13 to 25) are always in a rush to get to the act, so you may have to slow him down both before, during foreplay and while having intercourse to allow you to catch up to him.
Most important for a female to reach orgasm is comfort and security. Meaning having sex in a bed someplace where you will not be disturbed or overheared or intruded. Once you know what you need then you can teach your partner.
By the way this is fairly normal for people your age. Boys are quick on the trigger so research the web to find ways to slow him down and I think you will find what you are missing as well.
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