If you under the age, sex toys and what-not's aren't at your disposal. But I've come to find that our fingers are by far the best way to get the juices flowing.
Here was really gets me, first dim the room( if hot make it a bit cooler) The more relaxed you are the better the sensation. Next I like to come on solo and read long DETAILED stories. I will lightly stroke my pussy. Then I find a porno sight and watch a few vids just to get the imagination turning. So I'm not sure in what positioned you girls like to masturbate in but, I've found that I can get off while laying on my back.
SO!! If you lay on your stomach and twirl your clit in a circle motion you get off instantly. Without even touching the inside of the pussy. The pressure from lying on your hand makes for a better orgasm. After O'ing once, find a sharpie or a dildo and insert one into your ass one in the pussy. Lay again on your stomach and start playing with the one in your ass. The tweak the one in your pussy. Then really get going with your clit. But if your like me, and still tight be careful with the one in your pussy. It can cause pain if you fall forward on it.
Anyway do a combination off this and you will be in haven. Enjoy and I'm off to rock the boat. haha :)