I would focus on getting work/studies far away from your family. Getting a proper reason as well as a foundation to live off of is the best way to leave your family behind. I took off to the other side of the country many years ago, getting student accomodations and courses letting me stay in that for about 3 years. Well, if things had worked out with the studying.
It is definitely incredibly risky trying to run away with/to a stranger, especially if it ends up being with a stranger where the power dynamic is in their favour. Such as them being the financially stable one, or just older, or knowing the town better. Even if it starts out being very positive and caring, there's no guarantee that it stays that way for however long you would need to find your footing. From personal experience, "living off of" someone is a huge strain on even well established relationships, let alone strangers.