STD ??

Hey everyone so me and my boyfriend of almost 5 years and father of my 1 year old son broke up and he was the only one I had ever had sex with. Last weekend I had sex with a person I used to mess around with, well now I’m really fucking nervous. My vagina like where the bone is around the vagina hole (don’t give me an anatomy lesson I’m really nervous and can’t think straight) is very itchy, it burns when I pee (I don’t know if that’s just from itching and I randomly get like this warm sensation. Does this sound like and STD/STI ? I’m so nervous to call my doctor to get tested