What are they thinking?

Okay so basically I am a decent girl who goes for playing sport in the park and occasionally I play with the guys over there. But one day when they were sitting I overheard them and they said "Is she the girl?" And actually it's really weird, cause I have zero interaction with them. And I thought they were discussing about me but It happens with other guys as well, whenever guys notice me they either stare or they gossip with their friends when they see me another time.
I am cheerful and don't know if I give guys wrong signals. what to do?
What are they thinking?
Post Opinion