PLEASE HELP!!!

so a month ago i had really stupid unprotected sex with a guy and i’m afraid that i have a std. i don’t want to tell my mom because she is so overprotective over me and i’m underaged i can’t do anything without her knowing. i have no way of being able to go to the doctor and paying for medication. what do i do?! i’m freaking out. There is white stuff coming out of my vagina it’s itchy and sore..