What really is a bad relationship?

I'm young, sixteen. When i compare myself to my older sister, twenty four, I probably know nothing about relationships. She's major successful thought, she's married to the man of her dreams that she's been seeing for almost six years.
But I dunno, I'm lost. Her brain for romance never rubbed off on me. I'm oblivious when it comes to dropping hints, I'm clingy and always want to be with my significant other, I'm the worse communicator ever, and I'm a "big flirt" (Everyone tells me, but I don't see it). So when it comes to me trying to be in relationships, I'm hopeless.
Not saying that I've never been in a relationship, and that I'm doomed to be a cat lady. No, I'm sure eventually I'll fancy some lady or gent's fancy enough, I do have some quality characteristics (I like to clean and cook and grocery shop and not work.. I'd be a great housewife).
But lately I've been picking real winners.
:P
I , won't go in to the gorey details, but it's what it is. I shouldn't have been love stuck or stubborn and I should have noticed it was bad from the start. Firstly he was almost six years older than me, nearly guaranteeing trouble. Not saying never date an older guy either, cause they're all not bad.

This guy was a douche bag. I kinda noticed it when we were "together" but I never called him out on it, I'm not one to change people.
On top of it too, we weren't even together! "Friend's with benefits!"


I don't know not saying that when you date a douche he's gonna be a douche, he might need some warming up to. Ugu, just don't drink until you know (not think, know) you trust him.