Guests are often oblivious to things you think are monumental.
Example: On my friend's charteryacht, my captain who also captains that boat, was on the flybridge and got a call from the first mate/cook who said, "If this fire gets any bigger, you're going to have to come down here and help me." (Click went the intercom as she hung up abruptly.) That's the last thing a captain wants to hear. He put the yacht on autopilot and came downstairs (he's got one hell of a poker face of any captain I've ever met!). The cook didn't understand that you can't put Corningware on the stove top (what the ??? I wondered), and she was carmelizing sugar when the casserole bowl exploded and started a sugar fire on the cooktop with flames reaching up towards the cabinets overhead.
Guests just 20 feet away on the aft deck NEVER knew it happened!
Another reason I don't let anyone else cook in my galley!
So, don't feel so bad thinking the others saw or experienced something you felt was bad. Chances are, they didn't unless they mentioned it to you or you drew a crowd at the time. I, myself, am often criticized for being too open and honest and making that same kind of apology. I will apologize, for example, for the pilothouse AC going out during a day charter when no one knew it happened. My business partner often corrects me and tells me "shut up - no one knew; quit putting down the boat!" I am trying to change my ways about what I share with guests, but it's tough.
Reminds me...I was on another charteryacht I didn't own last summer. As we were pulling out of the slip at Miami Beach Marina (I hate that marina due to its nasty current which results in the story I'm about to tell), I had just finished making a tray of tropical drinks with those little umbrellas and was walking around serving. The current caught the yacht and we scraped the whole side down the anchor/bow of the neighboring megayacht, and fortunately, the other yacht was big enough that its pulpit never hit a glass window on the boat I was on - it ran down the side just above the row of glass; otherwise that would have been a real mess. I learned that day, that you don't react...just smile, serve drinks and make 'em extra strong!...AND IT NEVER HAPPENED! Only a few folks who were outside at the time knew we wrecked into another yacht. When we pulled back into the slip to talk to the crew on the other yacht, the guests thought we just forgot someone and were re-docking to pick them up. Worked for me! "What was that noise?" "What noise?" "Oh, I thought I heard a crash." Meanwhile I was picking up and sweeping up the debris down the side of the boat. The rest of the day was fantastic!.