Too deep?

I feel like I don’t know anyone with this problem but I’ll give it a shot. My boyfriend has a fairly large penis and honestly I’m a small girl I’m only 4’11”. But sometimes even in missionary if he puts it all the way in it’s almost painful. Most of the time it doesn’t happen in missionary, usually in other positions and it’s just annoying because I want him to be able to do what he wants but sometimes it’s just a little painful and idk what to do.