Arichter is telling the truth - this business is not what it used to be, and if you followed the hype that told you you can make a six-figure income you bought into a bill of goods as old as the hills. She's just trying to tell you like it is...however, that said, let me add my two cents, for what it may be worth...
You said "would like to sign up with signing companies. So far, I've signed up with snap docs, signingagent.com, notary cafe, 123 notary, notary rotary and a few others but haven't received any calls."
These are not signing companies - they are listing services only - they don't get work for you - it's up to you to market market market - don't focus on the fact that you're a "new signing agent" - don't even tell them - focus more on wording that convinces them that you'll give their clients top-notch service as a notary - convince them to hire you rather than the next guy.
Now..the reason they want experience is that too many notaries jump into this pool with absolutely no idea what they're doing - costing borrowers and companies a lot of unnecessary stress and, in some cases, financial loss. We read the horror stories every day of the clueless notary and what they did with te borrowers' loan.
Now, all this said - you're worried about signing up with companies, so I'm going to go out on a limb and guess you only took the NNA certification - because that's what they do - certify you, put you on signingagent.com and throw you to the wolves. Here's my suggestion to you - contact Notary2Pro (Carol Ray) - take their certification course or courses. They have a list of companies who are willing to use their new graduates and send them work. From what I've heard of her course you won't be disappointed.
One last thing to keep in mind if you're setting up your own business it's going to be 2 or 3 years before you are financially viable...so again, Arichter is right - don't give up your day job.