Since you are so young, I would recommend a visit to your Gyno to find out what may be causing your "dry spells." Which, by the way, is a pretty common problem, but if this has been happening on and off for four years, it's time for a look see.
Vaginal dryness can happen for a number of reasons and I believe the two leading causes are a hormone imbalance and not enough foreplay to get you adequately lubricated.
I had a real problem with dryness as I approached and went through menopause. My husband found many good lubricants that weren't sticky at all. I also believe there are "natural" products available in health food stores and some good co-ops. I know this because one of my girlfriends is a Lolla Granola type and she won't even have sex if her husband erection isn't "organic." (Whatever THAT means. I was scared to ask)
I'm sure there is an answer and a solution to your "problem," so don't sit and worry about it.........get out there, get help, get it on.
Peace
Greenlydia
talk to you doc about getting your hormones checked...an imbalance could be to blame
Thank you ladies for the useful advice!