FYI, you don't need a license, but you may need to prove you're at least 18, and, they get paid to not care about your scars, they get paid to make you feel confident. So does a sex therapist though, while maintaining boundaries of no touchy-feely stuff.
But I agree with what @Reallyreallyreally said earlier, it's demeaning to women to use them like that, even if you're paying. And I've also known sex workers who would disagree. But if it's not about mutual respect, it might not be a very satisfying experience.