When I load my game, you can only see the head of my skin and all the mobs, then if you you try to load a world the game just shows the hints it gives you when it's loading

When I load my game, you can only see the head of my skin, then if you try to load a world the game just shows the hints it gives you when it's loading the world but doesn't show the loading bar and doesn't load the game at all I tried restarting the game, restarting my phone and it just won't load at first it loaded but you could only see the head of the mobs everything less was invisible