Why, this is not weird at all. From my travels, over thousands of years, bodies come in all shapes and sizes. I have had the experience of towering over the smallest of beings only to be dwarfed myself on a different planet. Allow me to sooth your worries and insecurities, my dear anon.
Imagine walking into your room to see your FC pleasuring themself. They noticed immediately, turns into a blushing mess and apologised. You weren’t answering their questions or responding to their apologies, all you could say was…“ C-could I help you with that…?”