Stuck in a block

My geame always spawns me into a snow biome. Today I was mining and I found ten diamonds! I went further into a cave and found a small pool of water ing into to harvest the obsidian, but the microscopic current from the microscopic flowing water pushed me against my will into the lava and I LOST ALL OF MY TOOLS!!!!!!!!!!!!!!! I couldn't even tell what happened because of how slow my laggy game was!!

I respawned in the woods, even though I have slept in the bed in my house before. There was another glitch here where my legs spawned in a block and my character was randomly jumping up and down!

What is wrong with my game??!!