Hi! The last few months I've been experiencing a burning feeling during and after sex. I feel sore for even days after having sex. After I've had sex, it is painful to wipe myself after peeing and my discharge seems to be slightly yellow/brown (not thick at all). The area right below the vaginal opening hurts. I did not have this problem before and I know lubrication is not the problem. I also don't believe it could be an STI (I've only had protected sex) or bacterial vaginosis (I did a test which came out negative). Does anyone have an idea what could cause my discomfort?