Friend or Foe

Yesterday I had a student tell me that he considers me more of a friend than a teacher. Uh-oh. I've always been a strong advocate of the teacher being a TEACHER, not a friend that tries to fit in with the "cool crowd." So...is it okay for my students to think that way? I set boundaries in my classroom, and I set boundaries within my student-teacher relationships. I want the classroom to feel like a community, but I also want them to know that I'm the head of that community. Someone tell me, where is that line drawn? I thought I was already drawing it...