It’s normal to fear death, but constant worry is perhaps excessive. If we’re talking about literally every day, that’s too much.

In a mechanical sense, worry is a motivator for action. You should worry about death somewhat, because that means you avoid dying. Worrying beyond the point of practicality means your life is going to be less enjoyable.

If you can’t leave it alone, like the thought is hounding you, it might be time to visit a mental health professional. Even if you’re still functional, there’s no reason to not improve your living experience where you can. Don’t do that to yourself.