This is, on the one hand, fascinating, and on the other, just a tiny bit of a trainwreck.
The fascinating parts are the voice and the details, and the character himself, who appears to be on the brink of some dire action due to dire events, yet he spares a moment to be sad about losing his nice Italian shoes. I love that contrast; it instantly made me want to keep reading.
The "trainwreck" part is the handling of POV. It's not a major trainwreck but it did derail the story for me.
It starts off in a very self-consciously omniscient POV. (Our story, etc.) This is clearly an outside narrator speaking directly to the reader. It's old-fashioned, but you still occasionally find it in modern novels (Phillip Pullman used it in his Victorian thriller novels,
Ruby in the Smoke, et al.).
The omniscient narrator describes the young man, and then we get to this part:
To say things hadn’t turned out the way he expected would be a huge understatement, he thought
And that's where the train went off the tracks. Because the phrasing "To say things hadn't turned out..." is clearly still the omniscient narrator's voice, commenting on the story, explaining it to the reader. But then that commentary is abruptly presented as something the young man is thinking. To have the narrator's voice suddenly become the young man's voice was (for me, anyway) so weirdly disorienting that I instantly lost connection to the story.
It's a simple fix. Just eliminate "he thought" and keep the POV consistent. Or if you really want to delve into the young man's thoughts, make them distinctly his thoughts, not something the narrator would say.
One other thing that made me stumble was the shift in tense in the first sentence. It starts out present tense (our story begins) and then switches to past tense (the young man sat). You need to make it consistent, either--
Our story begins at the edge of a lake, where a young man in a grey suit is sitting barefoot in the darkness.
Or--
Our story (or The story) began at the edge of a lake, where a young man in a grey suit sat barefoot in the darkness.