I think the phrase is, "with fast money comes slow problems." I personally don't judge you for opting to go into sex work to fund your passion, but you have to accept the consequences of your decision to take the easier route on the come up. If sports were just a competitive venture, you'd be in the clear, but you know as well as I that sports is largely an entertainment venue, which means your value is not just calculated in your ability, but also in the publics desire to see you compete, and that's before you get into advertising and sponsorships.
Your concern about this material going public as an upcoming rider is accurate, because it is going to block you from endorsements, invitationals, and any publicly consumed events, because the organizers are at the whim of the audience.
My suggestion is either accept the consequences that your past decisions are going to reap, most notably your mitigated trajectory as a professional moto rider minus sponsors and endorsements. Or, utilize your own earnings to bypass relying on public perception to fund your career.