Red lump on genital area (not sti) Me!

It showed up today. I was about to get in shower and noticed it. It was large, too. I thought that maybe it was an ingrown hair, but i get a lot of those and this looks nothing like it. I squeezed on it because i thought i may be an ingrown and a little pus came out, followed by a little blood. All i think it did though was make it more painful and red. The lump is hard, too. It s right on the crease you get between your pubic area and your leg. I havn t shaved down there in two days i think. Please tell me what i need to do to make it go away and stop hurting. Im sitting in the bath right now trying to figure out what to do. I don t want to go to my parents beacuse i don t want to talk about the downstairs area with them. Also, i can t go to doctor because i don t want to talk to my parents. Let me clear up that im a 13 year old girl that has had her period but has never had ANY type of sex before. PLEASE HELP ME!