Hi peaceseeker16! I can see this from both sides of the story, I am not a professional by any means, but hopefully my input may help shed some light on this difficult situation.

Would it be fair for me to say that your biggest fear is that she is "putting on an act"? You don't know everything that happened in her past life and you are imagining the worst (prostitution). You might have struggles with these persistent thoughts that might affect your sexual attraction toward her, but you need to ask yourself, how much of those thoughts are true? You must find the root of why you feel this way, is it jealousy? Is it fear of potential cheating? Perhaps, it's her possibly leaving you in the future? Trust me, I can relate to being plagued with thoughts the "gross past" of others myself, but personally had to remind myself not to judge.

In your girlfriend's case, she's had to live in a dysfunctional environment, where you may or may not have. However, the way she was raised is a dark contrast to how average people are brought up. The reason why she is the best person ever, is because she is finally loved (by you). She has probably never felt real love before. I could guess that she was on a hunt for real love since her dad left. She "learned" (dysfunction) that men will give her love based on her looks. The sad thing is, she probably learned this at such an early age, that she became very skilled at it, and found a way to do it for money. Stripping. If she didn't love and trust you to her utmost, I'm sure she wouldn't have revealed her dark past. She is likely afraid of losing you, as you are of her. So, if she is the great woman you say she is, I can assure you, that she feels absolutely disgusting and wretched about her past. Maybe even cries about it sometimes.

I wouldn't press the issue with discovering more of her past, but I would suggest individual counselling for yourself before going to couple's counselling, which would be strongly suggested before committing to marriage.

I really hope this helped.