infection?

Okay so I'm in high school and I can't drive to and from school and both my parents work. I also don't wanna let my parents know I'm sexually active. But Friday I had a root beer and I opened it up in first period. It spilt all over me. I couldn't run home and change and none of my parents could pick me up and I had no other change of clothes. So it soaked through my pants and panties and touch my vagina. Most of it soaked up in my vaginal area. Me and my boyfriend of a little over 2 years use condoms and I wipe good and use ph balancing body wash. But I could change until I got home. So I basically had root beer down there for about 8-9 hours. When I got home to use the bathroom it hurt to urinate. I don't wanna go to the doctor since my parents and all. But I don't drink much water either or any fluids honestly. My discharge is fine. I have no symptoms of a uti or std or anything else it's just the pain when I urinate. I've been drinking more water lately since it said if you drink more water you could potentionally wash the bacteria out. It doesn't hurt to pee in the mornings it just starts to whenever it gets later in the day. I don't have to pee much. Normal urination counts. But I don't know what exactly what could be causing this if it's the fact that the root beer caused this or what. My urine is a light yellow, clear type color too. Any ideas?