When you mention I should say under the vagueness of, "I have been into some crazy things," should I leave it at that for her interpretation until she asks a question about it or should I say it along the lines of "I have past sins that I want to bring up?"
Not for interpretation necessarily; you are only one month in and it may not be necessary to pour out your entire life story right now. However, you need to be direct enough for her to understand "you have done some crazy things," and then it will be up to
her whether she wants to know more about it. A woman will find out if she wants to know; your job is to not deny her the truth - not to give her details. She is a woman; she will also be able to fill in the details exquisitely; she won't need your help. Tell her the truth tersely, but honestly until you two are at a point where you can share more.
Why do you recommend I not mention "didn't finish?" I mentioned it because I feel it's an essential fact that I left midway through the act. Is it because it goes into too much detail?
Yes; it is unnecessary. As I said, a woman will be able to fill in the details very well even without details. You saying
that is unnecessary, because the
meat of what you want to admit is that you went to a brothel. Your activity in between "A" and "B" is too much information, especially since the circumstances were what you said (i.e. you didn't finish). If you did what you did and got herpes, for example, you would have to be completely transparent. Your completion isn't germane to the point of your honesty.
I understand you want her to know that while you did sin, you had the character and resolve to come to your senses, and leave very quickly. However, that won't matter until both of you are mature as adults who indulge in relationships, and mature as a
couple - which takes several decades. Telling her that now will cause her to extrapolate what you are hiding, what you are marginalizing, and so on. You both are humans who make mistakes; she can mistake your honesty for deception.
What you should do first is talk to your Father. Ask Him exactly what you put in the OP, and I mean exactly. Talk to Him like you are talking to us, wait for His answer, an believe He will answer you.