I understand how you feel. My sperm donor decided he wanted to be a "dad" when I was 24,and had a 1 year old child. I gave it my best effort, but he was in it more out of curiosity than anything else. He had 3 other children that new him, as he was married to their mother and they were conceived after marriage. Those 3 adult children didn't want another sibling. They made it difficult on my donor and ultimately he caved to their wishes. He would reach out on father's day, my birthday, and Christmas. 2 years ago I told him I wanted absolutely no contact with him anymore. It was too difficult on me and my children. I said my peace, and I have forgiven all 4 of them. Funny thing is the 3 siblings have another sibling that came later from their mother and her new husband. He was accepted and welcomed. I guess it was different because he was an infant and I was an adult. Good luck on your journey.