Are you on birth control pills, specifically low-estrogen birth control? They can dry you out. I've heard low-estrogen birth control in particular can create vaginal problems similar to how menopause effects the vagina.

Tears can also be a symptom of yeast infections or bacterial vaginosis, even if you're not experiencing any other symptoms.

I don't know what lubes you've used, but shop around. There are a lot of great hypoallergenic lubes on Eden.

Hope that helps.