I would think the line would be at where people actually need help and those taking advantage of you because of your nature.

You have to draw a line that is comfortable for you and doesn't enable others to take advantage of you or hinders them to grow. There is a point where help is no longer helpful, but detrimental.

That is a huge thing when trying to teach something to someone. Eventually they are going to have to take some initiative to figure it out themselves. As long as it doesn't prevent you from going insane. A funny movie that deal with this issue is "What about Bob?" Bill Muray

I try and stop before I am a 'rescuer' on the Karpman drama triangle, but to be honest, I went and did a counselling course (where I learned about Karpman) because I also felt pretty constantly used. Kids, eh? Especially big ones. Anyway to explain, the Karpman triangle stands on one point. The bottom point is labelled 'victim', one of the top points is 'persecutor' and the other 'rescuer'. A rescuer might sound good but is as bad as a persecutor, for keeping a victim down. This is because: Persecutors say to victims: you can't, because you're useless. Rescuers say (by their actions): I will do it for you because you can't, because you're useless. They come from different angles but they both reinforce the state of incapacity and inability. They are practically enablers. Some people get bullied into feeling like victims and some people play victim because they realise its a good way to get rescuers to do everything for them. If you really really want to help people, then do it by never being the hero - never taking over and waving the magic wand, however much you want to, because that makes you a rescuer and reinforces 'victimhood' as their comfort zone. It does them no favours. I hope that makes sense!