Nobody is born a prostitute, obviously. I personally don't give a shit what circumstances may have driven them to it. Most of them are just doing it to feed a drug addiction anyway.
prostitution (as you've acknowledged) is often a consequence of drug addiction which is usually a consequence of mental health issues. people who are addicts and prostitutes have not usually chosen this path, the same way cancer victims do not choose this.
why be indifferent to one and angry at another?
drug addiction and mental illness are things that you claim to suffer from as well. lol?