How to let him know I like him?

I have know this certain guy my whole life as I have been going to school with him since preschool and we are seniors now. I have just realized last school year ( junior year ) that I like him. I really want to start by going to the movies or something like that sometime. I have Pe class with him and he talks to me sometimes but whenever we talk he is always smiling and so am I. I just don’t know what to do because I don’t have him on any social media besides Facebook and he doesn’t even use Facebook that much. What do I do when I am naturally shy? 🙈
How to let him know I like him?
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