are you aware that there is no physical world other than in our minds?

Actually Shakespeare had the best answer for this: "A rose by any other name would smell as sweet". Just because you know HOW matter is constructed doesn't make it any less real so the physical world exists very much, calling a solid object energy won't stop it from being a metal and feeling solid or interacting with other objects with all the properties we expect from a solid object. While the concept helps in better understanding of molecular physics, you can't apply it to regular physics and it could be misunderstood if you apply it to philosophical concepts which I very much doubt Einstein was doing there.

Without our minds there's no sight or hearing, no perception

So, let me get this straight. You're telling me it's all in my head?

I must have a defective brain, because this world is crazy.
Maybe Igor picked Abby Normal?

It depends on the level of self awareness, some even hardly know they exist at all, no matter, no sense, just nothing but plain existence 😁

I cannot believe either extremists saying that everything that exists is matter, or extremists that deny the existence of matter.

Are WE then spiritual beings (energy) having human experiences ?

According to string theory matter is indeed just vibration. Vibrations of different frequencies yield different matter. But I don't think that means it's just in our minds. Vibration is still something, even if it isn't technically matter.