Yesterday an old man stared at me strangely and I've been feeling creeped out ever since?

I'm a 14 year old girl. Last night at midnight I went to the theatre with my parents. There was an old man at the box office. He stared at me for 15 seconds before giving us our tickets. My parents pulled me away. Then, as we were walking out from the movie, he was waiting for me, and he stared again, stared at me all the way down to the parking lot. He had this strange hunger and fascination in his eyes. I'm really really creeped out and it's bothering me. What do I do?