Getting caught by stepparents might just be the worst thing possible.
When I was caught by my stepdad while living with him and my mother shortly after graduating college. I was kicked out of the house hours later. I was called a pervert and other such colorful names. I wasn't disowned, but that is likely what he was pushing for. My mother was a bit more gentile, but made it clear that I was no longer welcome in their house. I had only just started a new job and didn't even have a paycheck yet, so it wasn't easy to find another place to live without a proper deposit or down payment.
That was more than 10 years ago, and things are still very awkward between me and that side of my family. I'm not sure if you can never really recover from an experience like that. Sorry that happened and I hope in the long term, things go better for you than they did for me.