Question -- how do you get along with your dad (may or may not be one)? If you get along well and he's okay with not knowing -- I might tend to stick with that. I think it takes more than DNA to be a father -- the fact that someone else may be your dad will not automatically make the two of you fall in love with each other and be close. If you have what you need from your dad now, you may be terribly disappointed if you move on and he may be hurt as well.
I however have a nephew that was given up for adoption 22 years ago and wish he would come looking for us -- but he would be terribly disappointed in his birth mother (my sister) and I'm sure he did much better with his parents.
I'm sure your heart will lead you in the right direction and you will do what you need to do to feel whole again. Good luck.
