You are not less than zero, you are ahead because you were in a cult, but we're able to escape mentally, something that not everyone can do, so at least acknowledge that and give yourself a pat on the back.
And just because you didn't invent Facebook it doesn't mean you do not have gifts to bring to the world. Start working to figure out what that gift is, it may be something that you are doing already, it may be something you have yet to discover. Whatever it is, it will be a fascinating journey to find and develop that gift and you will learn and grow along the way.