My vagina is being weird.

Olivia
Okay so about 4 days ago I started getting kinda itchy. As the days have went on, I've been more itchy and it burns to use the bathroom. I looked at it and it doesn't look rashy or irritated. Me and my boyfriend (of 4 years) hasn't had sex for a month. Neither of us has an STD. I'm only 19, and I'm really worried. My mom told me to try monistat and it's not helping, so it isn't a yeast infection. What else could this be?! It just won't go away and I'm miserable! It's so bothering it makes me cry!!! Can someone give me any advice on what to do, or what it might be? I also don't really have any discharge. If I do it's just clear and watery. I have no odor. Just itch, and it burns to urinate. Please help!