HELP!!!

Okay so this guys move was rubbing me fromoutside my clothes and it started to hurt and he stopped but then I got home and both my labia had like SWOLEN!!! I am so scared that its not ganna go away or that I have an STD and idk how to check for an std at a doctor without my mom finding out... is this just cuz he rubbed so hard? What should I do?!?!