PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!?

Okay so I am in Cadets and in a few days were having a dance, and my best guy friend who is like a brother to me says he gonna slow dance with me so i was like okay, im 13 and hes 16 we cant date im too young. but i kinda like him, im scared when were dancing he might try to kiss me or something, all our friends will be thee and i dont want him to cause i love him a big brother, but how do i make sure he dsoent try to while were dancing please help im sooo nervous