Hello,
For your dryness of vagina,there are a few possibilities. It may be due to lack of foreplay before intercourse, medical conditions such as vaginusmus and pelvic pain,vaginitis,anxiety regarding performance,low estrogen levels,inflammation and infections of vagina, and drugs such as narcotics, tranquilizers, nicotine, alcohol and sedatives.
First of all, indulge in foreplay before intercourse and use some lubricants like such as KY jelly, or moisturizers, such as Replens or Senselle or vaginal estrogen creams.Also keep your pelvic area clean and wear cotton undergarments.
If it persists then get it evaluated especially vaginismus from a gynecologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Im a man but i know what thats like. I get horny with a woman clothed but when my clothes come off my penis shrinks and dries up. [No precum]. I think its psychological. Maybe you dont think you are attractive. But you are. I dont know you but you have alot to offer him.