ahh but that's exactly the mental trap case manufacturers want you to have! It's the "no one can help you" that EvilDoers tell their victims to put them into an "I'm helpless, and only you can take care of me" mindset (control their victims). Seriously, it really is. You are better than you think. It's precisely the case that makes you more clumsy and "helpless", causing you to handle your device that way....using the phone without a case is madness. Unless you're an Apple exec with a drawer full of free spares, you're gonna have a bad time.
Do yourself a test: if you have carpeted floors, go without your case for a few days. Yes you will have anxiety for about three days. Day 4, it fades. By day 6 or 7 you'll see what I mean. Plus, cased are a regressive tax and an inflationary measure to the total bill of sale. You don't need it.
You likely have an iPhone 12 or 13. You'll notice that you can (and should) pick it up by the flat edges and you can do so safely because that flat edge gives your fingers grip space. Likewise, you can even hold it regularly and safely by the flat edges with just two or three fingers; death grip not required (and a death grip paralyzes your muscles and inhibits grip tension after you release). If you have an iPhone 6-11, then you'll see what all this fuss is about lamenting and criticizing the rounded edge designs (because that also was stupid; merely a visual trick at the cost of comfortable hold and reasonable grip space).
Seriously, cases are a mental handicap and a mind trick. You're better than that. #YouCanDoIt