More than most activities, flying involves a lot of trusting that other people have done, or are doing, what they should to at least an adequate standard. Just trust. Sure, people can make posts citing examples where something went wrong, and I certainly could, but that's not the point. If you aspire to anything involving more than going out your front door, you're going to have to trust that other people are as diligent as you are - and you are as diligent as you should be too!
Aviation has many layers of safety redundancy built into it. The layers which interest you most at this point in your flying are airplane design, and maintenance. Have confidence that the design of the airplane, and the margins of safety will keep you out of trouble, in the air. With the exception of being too close to the ground (or another plane), generally, you can let go of the controls for a moment, the plane will sort itself out. Not that you should be in the habit of letting go of the controls, you should be flying, but know that your applying your modest skills to try to muscle a plane against its natural stability generally won't make the flight better, and just frustrates you.
Of course, you want a well maintained plane. They won't be perfect, its unlikely that you're learning to fly in a very new plane, they're just too costly for primary training. So, you'll see some wear and tear, that's probably okay, aircraft design includes a lot of margin for the airplane being safe, without being mechanically perfect - what's known as "service limits". Trust in the maintainers of the aircraft, it's safe. If you have a maintenance concern, express it as a question, rather than a challenge, you'll probably learn something (and be reminded that the plane you're flying may be 40 years old!).