There are many possible sources for these molecules so there is no way to say for sure. They exist today so they certainly existed at the beginning.Where are these molecules coming from?
I don't know that life had to begin with long chains of organic molecules that resembled amino acids and neither do you.Amino acids and proteins come from animals and plants. In other words, living things.
So how can you use amino acids and proteins in self replicating molecules unless plants and/or animals were in existence before that?
I tried to explain this to you before but your only interest was in arguing for what you believed. Even though what you believed was impossible to occur. So let me try again... life had to begin with long chains of organic molecules that resembled amino acids and folded themselves in the exact correct sequence according to chance. In this explanation there is no self replication. There is only chance.