Boyfriend felt something inside my vagina...Cyst?

My boyfriend was fingering me the other night and said that he felt something "hard, like a ball" in my vagina that he has never felt before. Is it a cyst???
 If so, what does that really mean? 
I am 17 and have never had penetrative sex, but my boyfriend fingers and performs oral on me. I do not take the pill or any form of birth control (assuming that is relevant info). 
Advice please!!!!! 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors