Welcome MaggieMay (love the Rod Stewart song)
Sorry you have seen so much in your young life. However, knowing what drugs can do to people and families, you probably know exactly what you need to do. You can be a friend and encourage help, but IMO, to become involved w/ a drug addict would be to continue your life that you have always known. Someone has to bread the cycle. Maybe you?
Keep posting and reading, lots of good people here.
susan