Help me !!!

I have a lump on the right side of my pubic hair and you cant see but you can feel it its under the skin and it feels like a marble when you press squeeze and when you leave it alone for 3-5 minutes it gets smaller but when u press or squeeze it again it comes back!! and i am soo worried that if its cancer or something like that i am 15 years old also. Please tell me wht it is im getting scared !!!💔💔💔😢😢