With runes and Masteries as Poppy?

What do you stack exactly or do you stack anything at all? Poppy is my favorite hero and i know she isn't in the best meta right now but i have majoooor difficulty figuring out what items, runes, masteries to get her. i tried everything from stacking damage, to armor, to lethality. Then i tried mixing a few things but with all of these specs or items i try to get i'm either super duper squishie or very slightly tanky. if shes a tank and not suitable for damage thats fine but why aren't i tanky at all? is there something i'm doing wrong like is there an item i should be getting or runes i should be getting? because no matter how i try to spin the wheel i can never really kill anything unless its a 3v1. Or my own adc carries outlive me during a teamfight even though i wasn't the one focused. Unless poppy is just a master of none and is only a support hybrid? any help would be appreciated! ^^ I looked up guides and builds but they all revolve around and but ive had both of those items and more and it just seems like i dont scale while at all at the mid-late game. Which is also weird because everyone says poppy does better late, when i'm the opposite i do better early lol help please?