Baby doesn’t like tummy time

Hannah • 26, Mother to Oliver, Nathan, and Mia. TTC👶💙 💖

He’s almost 6 months and stays on his tummy fine but gets angry and wants to sit up instead. He’s very good at sitting up and even rolls from his back to each of his sides. Should I be worried? I want him to be able to learn how to crawl but how can he if he doesn’t wanna be on his tummy?