Constant lag and crashing

My game is consistently unplayably laggy and glitchy (can often see through terrain, get minute long loading bars when interacting with traders, blocks take seconds to disappear after being mined, sometimes the game fully freezes and shuts down) and every time I close the game it has to force close due to an error. All my settings are on the lowest quality (no fancy graphics, lowest render distance, etc) and I’m playing an offline world.