When I join a world it keep on crashing

When I join a world it keep on crashing.Here is what happens:First, when I create a new world and load it up and I spawn in the world.This what happen first, there is a lot of lag when I try to move. Second, when I try to move to the right,left,up or down my hole screen glitches.Third, when I have in game music on the music like a bit mist up.Fourth, when I try to fly like try to double tap it
takes a while to fly then when it dose fly it crashes.Fifth, when I move and try to load the world it loads very slowly and sometime the light of the caves is black and when I go fast to try to load up the world it cash all the time and a it been doing this sence 1.0.0 PLS FIX IT I WANT TO PLAY MINECRAFT AGAIN I HAVE BEEN NOT BEEN ABLE TO PLAY FOR A LONG TIME.Thank you and keep up the good work.