Sweetheart... I think that you are going to have to tell your mom. I understand about the problems of a mother daughter relationship but when it comes to your heath you have to put that before your feelings. Just make sure that you tell her that you have not had sex. Hopefully that will make her feel more comfortable.
I've had these from time to time and they are very much like a pimple. It helps to soak in a warm bath. In my case, they always felt MUCH better after they popped because the pus came out and they were able to heal.
Yes, it will hurt a bit to pop, but the relief is almost instant. It also helps to put some triple antibiotic ointment on it once it's popped to help healing.
If it doesn't pop, and the pain gets much worse, you may need to be seen. I had one that didn't pop and wouldn't heal that needed to be opened at the doctor's. (WORST case scenario.. mine always usually "pop")
It sounds like a boil. Its like a pimple, but very painful to pop. I have had them, though I don't recall it being itchy, just very sore.
Try googling images of boils, and it its the same thing, look up ways of getting rid of it.
Good luck!