Lump Inside My Groin?

There has been a small pea sized lump, maybe a little bigger around the side of groin. It's been there for about a week. it's just under the skin and I can actually grab hold of it / pinch it so it's not attached to anything. No discoloration and no pain unless i grab onto it through my skin. Once i let go, the pain is very sharp and hurts for about 20 seconds. Im 15, so i dont go to a gyno or anything. Should i go see a doctor or tell my parent? Could this be something serious? Please help.