Please help me? I'm not a troll?

[Peter]

I'm depressed because about eight weeks ago (yeah, I still can't get over it). I was talking to a dominatrix online. I think I have a sex addiction. So the point is to do stuff that she tells you to do and you get a rise out of that. She told me to go into my sister's room, take her underwear, and put them in my mouth. I did it. Why? Because I'm a moron, perhaps? I'm sixteen, by the way, nearly seventeen. What should I do? I wish I could go back in time...