DOES SANTA CLAUSE REALLY EXIST PLEASE TELL THE TRUTH?

the kids at school make fun of me because im 17 and still believe in santa my parents say hes really and i believe them cus they would never lie to me but i hate being made fun of omg does he really exist? how do i proove to my classm8s that he is real

thank you for your help have a wonderful holiday xoxo
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