How can I find a truly easy, sexually free, loose girl to have dirty sex with me one time, before I die?

Be the kind of individual a sexually confident, highly libidinous woman wants to fuck.  You seem as fun as a root canal without novacaine.

Pro-tip: if you’re looking for pity sex, which your “one time, before I die” remark highly suggests, you decrease your appeal and chance for satisfying sex exponentially. Even if she agrees to sleep with you, the sex you’re fantasizing about will most likely not happen, especially if it’s a one-off.

The kind of woman you desire has standards. Insecure, desperate individuals won’t make the cut.

I would suggest improving your overall outlook on life generally. That way, you’ll bring the joy you have and share outside of the bedroom into it as well (i.e., she’ll want to do it with you as much as you want to do it with her).

In lieu of that, a sex worker might agree to your terms. Be warned that it won’t cure depression, misogyny, or a cynical outlook on life.