I feel a lump in my scrotum it is mostly to the left and it is oddly mishaped. I only felt it about 5 months ago, I thought it would vanish but it hasn't. Additional information: I'm 12 turning 13 this year, currently on stage 2.9 with puberty.
Assuming that the lump is not on your testicle, but in your scrotum, what you most likely are feeling is a varicocle. The veins in your body have small valves to keep blood from pooling in the lower parts of your body from backflow. In about 15% of men, one or more of the valves fail. The blood swells the veins in the area, leaving a lump that feels like a lump of spaghetti noodles. It is almost always on the left side of the scrotum. See: Varicocle.
Usually varicocle doesn't need treatment, unless it is suspected to be causing infertility. In that case surgery can correct the problem and restore fertility.
You should see a doctor to confirm that this is truly what you have.