Just kidding, yet there is some truth to it. It is a long road with a ton of hard knocks. If you are tenacious and hard-working, that's a start. You really need to believe in you, when no one else does, and find a niche, something you can call your own. Also, call Screen Actors Guild.
All agencies including modeling agencies are listed, that are legitimate.
Beware if you are talking with someone who isn't on the list. When you book a job through them, then, and only then do they receive a commission. Marilyn Monroe . She was so before her time. I used to watch her old movies and run to my mom's closet and play dress-up in her slips and heels, which were way too big for me.