Hi, have you discussed this with a doctor? You might have some underlying condition that makes you more prone to cuts (in other words, makes your skin more sensitive there than average).
Ugh, that sounds a pain, literally and figuratively. I agree with Annie that it is time to see a doctor. There is something called Vulvar Granuloma Fisuratum to look into. It's related to vulvar lichen schlerosis. https://www.mayoclinic.org/diseases-conditions/lichen-sclerosus/symptoms-causes/syc-20374448 This article describes it. It has various symptoms and you describe some of them perfectly. They have a hard time knowing what causes it but it seems to be related to an overactive immune system or hormones. A doctor needs to see it. They might prescribe an ointment (coriticosteriods are common) to treat it. There are other things they use as well. But I would suggest seeing your doctor. Let us know.