Is it appropriate for a TA to say "My Students"? I am a teaching assistant for the first time this semester. A couple of friends have asked how it is going, and I have used phrases like "some of my students..." or "my students are ..." when telling them my experiences.

I'm not so concerned when talking to my friends, but in an academic setting (ex. talking to another professor) is it appropriate for me to say "my students" when referring to the students in the class which I am TA'ing for? 

I'm definitely leaning towards "no", because I am not the one instructing the class, I am just helping instruct the class, but I'd like to get SE's opinion.
Yes, it is perfectly appropriate to refer to students in a class you are TAing as "my students."

You are teaching them; hence, they are your students. It doesn't really matter whether or not you are the primary instructor.