Eoghan, your story is similar to mine with regard to Stoicism. I too dipped my toes into the Stoic pond for a while although I came to it through my curiosity about Virtue (that's another story). I too stared at the question of "why is virtue itself a good?" and its obvious answer "because it feels good".
Further, I kept coming across nasty comments about Epicurus so started wondering more about him. His goal of pleasure fit with my other passion, Buddhism, with its goal of reduced suffering. (also no gods, eternal universe etc.).
So welcome and may you have conversations here that build a pleasant life.