Disclaimer that I am not a full-time agent (I have a license, but I have a full-time W2 job outside real estate), but I can offer some valuable statistical insight from other similar industries (since you seem to be snooping around for info before deciding on a career change).
A real estate agent is largely going to be the same meritocracy that most all sales jobs follow (in other words, you eat what you kill). This can be both good and bad. The bad news is that sales jobs have low barrier to entry and thus extremely high wash out rates. In many financial services sales jobs, a firm might bring in 10 entry level recruits expecting that 1 will still be there in 18 months. The good news for those who do survive the pain period is that the upside is technically uncapped but certainly never a guarantee. Consider this study done on real estate agent income versus tenure...
The people who thrive as agents (the people who don't just survive the first few years but actually beat these averages) likely have one or both of the following two things going for them:
1) They also have their broker's license, and thus are also getting small pieces of all their agents' deals too (residual income, which is probably the next best thing to passive income).
2) They have so much tenure and clout in their region that their referral network is almost self-sustaining. This likely takes many years and much dedication to accomplish.
Not trying to persuade or dissuade, but it's just important to understand that any numbers people might be willing to give you on their personal income are going to be anecdotal and not necessarily representative of the industry as a whole. Try to do some broader research on industry standards and best practices, and then use that to decide if this is what you'd like to do.