I'm not alone

I was playing Minecraft 1.2.0 on my Kindle Fire with an Xbox Account. I wanted to play some Lifeboat. I won. I was making a new world in survival and was playing with some Omlet Arcade users IN that world. We were building some shelter. Me and the rest went to go cut some trees for more wood. I saw a tree with a sign saying "HE put this here". I broke it off the wood and started breaking the wood. We found a village with no villagers for some strange reason... No crops were being planted. I asked one player if it killed the villagers and broke the crops. It said no. It was strange seeing a village like that. But there were items in a blacksmith house. We got the items and went back to the house. The door was gone for the house. We put a door for the house again. An Alex skin player joined the game and said "IWILLBEBACK". Then it left. It had a name with a smiley face ---> :). I said in the chat "That was strange... Fire spawned on the house. We tried putting it out. It burned out some planks. A distorted Ghast scream was heard. I was scared and typed a face in the chat "O_O". An other player said "WHAT WAS THAT FOR DUDE?!". I replied to him "i didnt play that sound, cheats were off!!". A player left the game because he was scared. It wasn't my connection. We all were killed by nothing. A message said "IWILLCOMEFORYOUGIBSON". It knew my REAL name. I saw a sign outside somewhere saying "×_×" four times. I didn't place the sign I was still holding on my inventory. I tried breaking that sign but a message in the chat said "I WON'T LET YOU DO THAT.". I was scared alot. The game was glitching. Some kind of entity or player was behind me. It was white. It ran so, so fast to me, my game crashed.