I have a bump on my libia majora. It's white-sh and it has discharge that's brownish. It hurts a little but I'm very worried! Please respons?

Bartholin Gland. What you are describing can be infected drainage from a bartholin gland. Bartholin glands provide lubrication for the vagina. Sometimes they become blocked and become infected. This is a bartholin abscess. It sounds like you have a small abscess that is draining. Wash with soap and water, hot soaks and see if it gets better. If not see a doctor.
Could be cyst infect. Could be an infected cyst , speak to you mom ( age 16 doctor will not see you with out guardian ) go to the doctor with your mom , will give you antibiotics, if there is pus will drain it don't worry you will be fine.