Short Girl Sex Problems! Help!

My boyfriend and I recently started having sex (we were both each other’s first❤️ ) but one of the biggest issues is the height difference. He’s 6’6 and I’m 5’3. It’s either he’s having to hunch over (he has a bad back from working in a factory and can’t stand missionary for long) or I’m on top (which I love 😍, but I have bad knees due to being overweight for so long and after losing it i cant ride on top for so long). We’ve even tried with him standing up and me laying down but I’m a foot shorter and it’s really hard sometimes for him to get close enough to put it in. Are there any like positions we can look up to try and help with that? Help a sister out ❤️

^ an accurate representation of the one time we tried doggy.