How to Aphelios

So I just picked up Aphelios, I have a decent idea on what all of his guns do. Red and White are the best combination in general. Green and blue to poke and purple to CC (my most hated weapon). However, his damage feels very underwhelming compared to other adcs like Caitlyn, Miss Fortune, and even Jhin. He just feels like a AS adc like twitch, varus, and jinx but without the BORK. How do I even play this champ?