What have I gotten myself into?

From Richard Henry Dana's Two Years Before the Mast. His first night out on the ship in the open sea.

In a few minutes the slide of the hatch was thrown back, which let down the noise and tumult of the deck still louder, the loud cry of "All hands, ahoy! tumble up here and take in sail," saluted our ears, and the hatch was quickly shut again. When I got upon deck, a new scene and a new experience were before me. The little brig was close hauled upon the wind, and lying over, as it then seemed to me, nearly upon her beam ends. The heavy head sea was beating against her bows with the noise and force almost of a sledge-hammer, and flying over the deck, drenching us completely through. The topsail halyards had been let go, and the great sails filling out and backing against the masts with a noise like thunder. The wind was whistling through the rigging, loose ropes flying about; loud and, to me, unintelligible orders constantly given and rapidly executed, and the sailors "singing out" at the ropes in their hoarse and peculiar strains.
In addition to all this, I had not got my "sea legs on," was dreadfully sick, with hardly strength enough to hold on to anything, and it was "pitch dark." This was my state when I was ordered aloft, for the first time, to reef topsails.

How I got along, I cannot now remember. I "laid out" on the yards and held on with all my strength. I could not have been of much service, for I remember having been sick several times before I left the topsail yard. Soon all was snug aloft, and we were again allowed to go below. This I did not consider much of a favor, for the confusion of everything below, and that inexpressible sickening smell, caused by the shaking up of the bilge-water in the hold, made the steerage but an indifferent refuge from the cold, wet decks. I had often read of the nautical experiences of others, but I felt as though there could be none worse than mine; for in addition to every other evil, I could not but remember that this was only the first night of a two years' voyage. When we were on deck we were not much better off, for we were continually ordered about by the officer, who said that it was good for us to be in motion. Yet anything was better than the horrible state of things below.