How i found diamonds, and lost them in he first five minutes- minecraft

So, I must say I was starting a new survival game, in which I would play alone.

So found a LOT OF THINGS,  I'll describe them in a shortlist

1. Iron armor, village chest.

2. 3 Iron, same chest.

3. Finished nether portal, Flint and Steel (FS), portal loot chest.

4. Enchanted gold helmet (mending), portal loot chest.

Needless to say, I,  was amazed by this world, I found A LOT OF LOOT, but that was not all, I made my way down to the ravine next o the village, and found, not 5, not 6, not 7, but 8 diamonds, I ran back up the stairs I made, without notice, there was a CREEPER, when I noticed, it was too late, I went flying and FELL IN LAVA, yes everything I had done, every single piece of loot, everything lost to a CREEPER. So be careful with creepers, OH! I forgot!, I don't have the seed for the world, so I can't replay it, and no, I don't have backups.