Thanks for sharing your story.
At the expense of being redundant I must say that you are very articulate and write very well for your age. You also seem like a very intelligent person.
Although I was a convert from a non-Muslim background for a few years Islam nearly ruined my life and I'm still patching up some of those wounds so I kinda know how you feel.
Regarding your sister: She seriously needs some intervention to get her life back on track. She sounds like an extreme case of one of my ex sisters-in-law who acts the family mullah.