I work in aviation, currently for a major UK carrier.
My usual advice to nervous flyers is to watch the cabin crew carefully. Observe their behaviour, interactions and body language.
Do they look scared? Worried? Stressed? Or do they seem relaxed, just getting on with their work as usual on another normal day at the 'office'?
Are they chatting normally between themselves like you do with your colleagues? When the safety demo is done and the cabin is secure for take-off, do they look worried? Or do they just sit there waiting calmly until it's time to get on with the service?
When service is done do they just relax and chill out, maybe chatting or reading?
If anything was wrong with the aircraft, the crew would probably be aware of it, so if they are just getting on with work as usual, you can be fairly sure there is nothing to worry about.
You are in more danger while driving to the airport than when flying, so relax.