Alberqwerty,
I was on my own from 2 months pregant and not one day have I regretted having her. I have always been proud to call her mine and was happy to share her with her father if he wanted to, It was frustrating at times, but everything she is I have been there for, she is 16 and will soon be making her own way in life.
I don't feel any pain at all for what we have been through, it has been an adventure and I may not have always been the best mum in the world, but I have been the best mum I have been able to and it seems to have done us ok.
The only thing is now she does not call him dad, he is called Simon, Her choice and I see no benefits in telling her the truth about it all. I was on my own until 3 years ago with her and we have grown up together.
I let go of any anger the day I felt her move in my belly, probably before. But then it may be a lot easier when you don't live with the father!