Vagina irritation PLEASE HELP

So this has been messing with me for a few weeks now. It’s super dry and itches and burns bad. I think it’s just raw from itching ? Does anyone know exactly what it is? I am sexually active but I’ve been with the same guy for three years so I can’t have any disease or anything. Does anyone know what it is or what I can put on it to make it feel better/ heal ??