Those who said director/producer/screenwriter/editor/et... clearly don't have a clue what the reality REALLY is. The chances of becoming successful as those jobs are exactly the chances of becoming successful as an actor. They're also just as hard to get and even harder to keep. And all take a lot of hard work to get to, plenty of luck, prior experience, and connections and/or representation (you can't just apply for most of these jobs). Connections is actually a big one. If you don't have any, you have a problem. Also, you just have to live in LA or, as a compromise with even smaller chances of succeeding, NYC..
In short, the chances that you will get paid ANYTHING through those jobs are small. The vast majority of directors/producers/writers, etc. have a regular day job in addition, to support themselves, just like everybody else. Only a very very very very very small percentage rely solely on those. So you'll need another job either way. Although, honestly, it doesn't sound like anything that has to do with arts or entertainment is for you. You're not being realistic and you're not determined enough from the get-go.