Hi,
You are only 13 years old, and the bumps you are having might indicate a possible infection of your pelvis.
You need to be examined by your
medical doctor in order to determine the right infection type and start proper treatment.
If it stings when you pee, might be related to
urinary tract infection too.
If you had an intercourse, then, should be further evaluated for STDs too.
If you use to shave the area, might be an infection of the skin after shaving.
So, there are many diagnosis that should properly made. You can send a photo of the affected area and send it directly to my profile http://doctor.healthcaremagic.com/doctors/dr-albana-sejdini/66604
So, calm down, it is not a shame to talk to your parents about such problems as they are common. Get helped as soon as possible!
Dr.Alba