Mine isn't a direct ancestor, a distant great uncle on my mum's side. He grew up in a large family of about 10 children in the 1850s/60s in a very rural part of Scotland. He obviously decided he didn't want to be an ag lab like everyone else and joined the merchant navy aged 14. I have found him on records at ports in Sydney and Shanghai in the 1860s, the things he must have seen and experienced as a teenager, so different from his siblings.
The very BEST thing I found though was the captain's diaries included in the Liverpool, England, Crew Lists 1861-1919 collection on Ancestry, it is an account of the voyage full of people deserting, drunken cooks, people refusing to work and a grisly account of Joseph's death from some sort of tropical disease. The captain describes his burial at sea and gives the exact latitude/longitude at the time, somewhere in the Indian Ocean off Madagascar.