How, where, or who?
Since you asked "how" I will address that one first.
Just be open and honest. You're not the first person to be in the situation that you are in. Most likely, any experienced spiritual counselor or knowledgable Catholic has either been there are worked with someone who's been in the same situation; so don't be afraid to ask WHATEVER is on your heart. Do it with sincerety and an open heart and mind.
Where? This forum or your local parish. Doing a search through the forums with the topics of your questions should yield a lot of good results.
Who? You could schedule an appointment with a priest, deacon, RCIA staff, or a faith formation leader in your local parish. Pray to Our Lord; ask for guidance and the revelation of the truth and the willingness to accept what is true and to be guarded against anything that might be a "false truth."
I hope this helps. I will be praying for you on your journey.
Peace of Christ,