I live on the Earth. The Earth is a planet. This fact is okay. I am living in truth.
You need to re-think your relationship to material possessions in terms of things that occupy your time. The things that are physically closest to you. Time and space.
The items that you use incessantly, the items you employ every day, the normal, boring goods that don't seem luxurious or romantic: these are the critical ones. They are truly central. The everyday object is the monarch of all objects. It's in your time most, it's in your space most.
Stuff breaks, ages, rusts, wears out, decays. Entropy is an inherent property of time and space. Understand this fact. Expect this. The laws of physics are all right, they should not provoke anguished spasms of denial.
This material culture of today is not sustainable. Most of the things you own are almost certainly made to 20th century standards, which are very bad.
You should be planning, expecting, desiring to live among material surroundings created, manufactured, distributed, through radically different methods from today's. It is your moral duty to aid this transformative process. This means you should encourage the best industrial design.