No clue what to do.

Feeling hella frustrated right now, I’m a 17 yr old guy, around 152lbs or so, and have been working out for a few months now but seeing practically no progress. Resolved as a last ditch effort for that perfect “summer body” to get on a diet or start meal prepping, although I still have no clue how to go about losing weight. So far have practically no chest, like 3 abs near the top, and a significant pocket of fat near the navel. Any advice or useful things I should know? I know the basics like eat plenty of proteins like eggs and chicken, healthy fats like avocado, and a few others but how should I apply it.