I am 20 and I realize I do not get wet anymore.

Natasha,

Perhaps you are under stress and your ability to self-lubricate is in a low phase. It also happens as we age and it happens periodically throughout life as our hormones rise and fall. 

Have you changed any medications during this phase? Lots of medicines can cause vaginal dryness as a side effect. 

Maybe your sexual activity needs a pick me up. Slow your love-making down and allow for more nonsexual touching, kissing and fondling to enable you to become more fully aroused. Then consider trying to do sexual acts differently in order to keep your love life fresh and your juices flowing. What fantasies might you want to try? How about a new toy or position? 

A poor diet can also cause changes in your natural lubrication. Eat more fruits, less carbs. Take vitamins, especially zinc which helps with lubrication. 

How often are you having sex? Having sex regularly naturally keeps the juices flowing so keep trying to stay connected and let your body relax and enjoy the wonderful sensations! 

Lastly, Female arousal usually takes more time than male arousal, so foreplay is crucial. Most women turn on from north to south. In other words, your brain needs to feel sexy so that your body can feel sexy. Other factors that affect arousal and lubrication are hormone levels, stress, diet, sleep, drugs, diet, and lack of exercise. 

Best,

Rosa