Do you think I owe my father something?

So the thing is, I know his name and where he lives (long story) but I've never met him. He isn't even aware of my existence. My mom got pregnant in high school and never told him. I just found out about him about 5 years ago. Me and my mom had a lot of issues after this all came out, so my life consisted of basically fighting with her all the time, but now that our relationship is moving in the right direction she's saying maybe it would be a good idea to just meet him. I really don't want to. I'm scared of being rejected. Actually, terrified of being rejected by him. I was talking to my fiancee the other day and she thinks I should at least contact him. She said "Don't you think you owe him that much?" That kind of made me mad. I mean, I owe him? I told her "He's a total stranger, how do I owe him?" and we went back and forth for awhile but I digress. I'm very content with just living my life not ever knowing him, but I don't know if that would be the right choice. Do I owe him something?