Brushstrokes of Despair

(Note: This is my first Fanon Minecraft Story, I enjoy constructive criticism, but please don't intentionally try and harm my feelings, okay?)
===The Post===
There was a post online, by someone named Maj, it was pretty interesting. The "challenge" was to make a Minecraft world with the seed of your Minecraft username, I was intrigued. Soon, in my recommendations I saw a thread, people were also attempting the challenge, there were split in half hills, islands, harsh spawns, forest fires. These were some pretty odd results, and then I saw another post by Puzzle6718, a strange mob, a table? I couldn't resist trying it out, but with my potato laptop, I can't run anything past the beta. But beta was the best I could get, and I typed my username; "Astaline" into the seed and loaded the world.
===The World===
I spawned in in a canyon-like lake, I couldn't fly or anything, so I dug a staircase up to a higher location, and took this screenshot.
It wasn't ideal, and with the clunky movement of the earlier times, I fell into the strangely placed holes. I suspiciously inspected them for a minute but shrugged it off as beta world generation. The nostalgic Sweden song began to play in the background, it felt just like the old days. I decided it wasn't a good building location, with the holes, and the general lake I ran off into the direction of the background forest. I felt like there were an odd amount of holes, and the river continued, similarly to earlier I kept falling in, I swear I saw 4 sploches of diamonds in one, (sorry for no screenshot, I couldn't find it in my folder). I saw a fairy ring too, made of brown mushrooms. All these terrain generations were pretty cool for just my username, most of the others had bummer seeds, but maybe you appreciated more when you had less? I finally found a small pit, it was interesting, and I fell down, but I pillared back up. On the final block up I swear I saw something. Heres the screenshot of the area before I did anything to it.
I thought it was pretty fresh, or as I might say.. funky fresh. I decided to start landscaping. I was thinking about making it my base location, it was pretty easy to terraform, just needed to patch a few walls, dig out the floor. I looked up, a wierd pillar, . This would make a perfect pillar to turn into logs, however when I tried to break it, it blasted me back, similar to a creeper explosion, however those weren't implemented yet. I edged out a border around it and marked it with red wool. Just to be cautious.
Afterwards I began to clear out more area, I saw a hole, I thought it was pointless, but I decided to go in.
It was signifficantly deeper than I was expecting, with several branches, I decided to go straight down. As far as I could. I found a massive coal vein, streching mutliple "rooms" until I was generally back around where the pillar was above the surface. There was a similar one implanted into the ground, does it go straight down?
I don't know what to do next, I turned off the game afterwards... but this certainly isn't done.
(TO BE CONTINUED)