Yes and no, it was never a huge deal to me while I was growing up and I had other men around me (although none of them were good influences and all were abusive to either me or someone else in my family). He is not a huge influence on my life I don't think, but at the same time, I think deep inside I'm disappointed, or something, I don't know, that I will never have a good father/daughter relationship with him (or anyone else) and that he's just another alcoholic, drug using, angry man. I think how that affects me is something I'm yet to fully discover.
I will say though that one time it did kind of hit me while I was out shopping one day. There were these 2 girls with their father next to me and they were asking if they could have something, and he said yeah. But the relationship they obviously had was a great one, he seemed like one of those really fun, caring fathers, and I ended up walking away from them practically in tears because I have and will never have that kind of relationship with my father or a father influence. I think that hurts me more than I realise, but I just don't know. I do know it affects my ability to have a relationship in general, I've never had one. But that's something I'm too scared to talk about.
My father and others around him have said and done some very hurtful things to me in the time that I have known him, and my reluctance to talk about him is partly due to my grandfathers attitude about him, he hates my father and won't even take me to see him (yet he'll take me anywhere else I need to go, even an hour and a half drive to get a washing machine), he has only even met my father once. So I feel extremely ashamed to talk about him to a lot of people. I just don't understand what the hell his problem is.

This part of my life is something I haven't talked too much about (and yes I know I talk about a LOT of crap, and yes I could go on and on, and yes I sometimes feel like I have so many past issues that people must think I'm lying, but it's just what I've experienced, too much drama).

This is why I want to know if there is anyone else who has had a similar situation, it may help me realise how I actually feel. I know something is there.
I wasn't adopted also (from the link you shared), my mother just didn't bother to tell him I existed.