My aunt works at my high school and always embarres me and it is making me really mad?

Alright so I'm in 10th grade and my aunt is the istant principal at my high school. (Talk about embarring!) And well last year in 9th grade I never saw her so no one knew she was my aunt so I was happy, but this year she stands in the cafeteria with the other istant principal and watches the lunch lines and makes sure everything in the lunchroom is moving smoothly and I wouldn't mind that as long as she didn't see me. BUT guess what? She sees me everyday in the lunchroom and gives me a huge hug and yells "This is my wonderful niece Molly!" And then by then the whole cafeteria is watching and then she starts singing this dorky song "Molly by golly fee fie bo bo banana fi fana it's Molly!" I think that's how it goes I don't know, but this same thing happens every day! And when I'm sitting and talking to my friends at lunch she walks up to our table and asks all of my friends "Are you guys being nice to my niece?" And then they are all like, "Uh yeah..." And this happens every day too and now I sit by myself at lunch because I don't want to be embarred in front of my friends. And now my aunt sees me sitting alone at lunch every day and sits at the table with me and eats with me because she thinks that I'm a loner! UGH!!! And too top it all off the whole lunchroom is staring at me and laughing at me, because now the whole school knows that she is my aunt which is not what I wanted! Don't get me wrong I love my aunt, but god can't she just leave me alone at school. This is making me depressed, because I don't know how to tell her to stop talking to me at school.