Am I counted as a thief if I know it;s being stolen?

Okay, I go to the library to do homework. Recently, I saw some kids I know hanging out there too. They said hey come hang with us so I said "Ehh, what the hell." When I go with them, I see that they take some games off the shelves and put them into a lunchbox, they then threw the lunchbox over the sensors. It was about two games and no one seemed to notice, so I decided to not think of it as a big deal (ALL STEALING IS BAD!). he next day they go back and this time, they have TONS of games! They spend a lot of time by the game shelves and the librarians were watching. When they stole them, I thought they were . Now that I think about it A. They probably do an invintory check, B. They stole about 400$ in games! And C. Were 13, the library knows where I live. Now I don;t know what to do? Will I get charged the same as them IF we get caught, even though I didn't take them. Any help on what to do?