Game lags too much!

Ok so whenever I play on realms the game lags so bad that I'm not able to use the chat box move my character or use my items like opening and closing door's. My friend and I were just playing in Realms and hour ago today and he had exclaimed that i was floating! I wasn't using any mod's to fly or anything but he saw me floating. I'm also not able to kill a mob due to this problem but the kill me instantly. Please fix I'm using an Android Samsung Galaxy Discover.

I expected to be able to move regularly and open close doors.

Game lagged so bad that I was frozen to my spot and wasn't able to move or do anything.

Steps to Reproduce:
1. All I did was spawn into the game and it started lagging.
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