How to talk to a guy as a very introverted person?

So, there's this guy in my honors English class, and he's really cute, super funny, and extremely extroverted. I, a hopeless romantic, most likely neurodivergent, and extremely introverted struggle talking to people horribly, especially in person. I got his number from a mutual and we texted a bit the other night and I always catch him looking at me (which I'm probably overthinking). He's new to the area, just moved, single (my friend asked), so he doesn't know many. I sometimes feel like I'm either coming off too strong or anything. But I struggle talking to him, and I want to subtly flirt with him and maybe ask him to our homecoming since it's the 14th of September. I just struggle with what to say or do, I panic and freak out at school trying to talk to him. I also cannot fathom the idea that someone would actually like me.
How to talk to a guy as a very introverted person?
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