Unlikable mary sue character who constantly toots his own horn and boasts about how smart he is, boring cookie cutter world building straight from a how to book

Unlikable mary sue character who constantly toots his own horn and boasts about how smart he is, boring cookie cutter world building straight from a how to book. This made the protagonist extremely annoying like a teenager who thinks he’s smart and talented because of good grades and then ends up working as a web dev later in life.