tl;dr
My advice for newbies :
PLEASE, DONT NEVER TRY FUTURE.
PLEASE, DONT NEVER USE THE MONEY THAT YOU NEED FOR YOUR LIVING.
PLEASE, DON'T NEVER TAKE The MONEY FROM THE BANK AND TARDE WITH IT.
I just read the words that are in capital letters and I think its enough to know what is the main idea behind the OP's post.
I agree with you and I think many of us will agree because there are some traders including me who tried futures trading and failed. I still remember when I double my money in a short amount of time but I did it thru many trades (like swing trading but in the futures). All of the profits and the initial capital that I used in futures trading got wiped out in just a single trade. I did one single trade mistake and I lost all of my profits and my capital. After that I didn't do futures trading anymore. Futures isn't for everyone. Futures is for the expert people and those who are ready to lose their money if they made a single mistake.
You should read first what's the essence of this thread. Emphasizing the error on the OP while the purpose of this whole thread is to show his mistakes so that newbie don't copy it is kinda weird. Although all your advice are all correct way to trade safely especially for futures trading.
This 20K USD loses is super huge to risk on futures trading without any background or good strategy before starting it. Even pro traders are experiencing loss on futures so what's more for newbie. OP is such a risk taker.