Adopted, sperm donor, etc.

I need to get something off my chest and maybe sorted out. Who knows. Anyway, i was adopted at age 12. I have the same mother but I got adopted by a different man who I love and appreciate so much. So the issue is, my biological father. I am missing out on something in my life. I know in your eyes a bum if he left me at such a young age. Regardless I have this spot in my heart for him. I have tried for years we both would make plans or ask each other if we want to do this or that however he is not interested period. Sooo the problem I have is he decides it's cool to give away my brother and myself to be with a woman who has 2 girls of her own. But I wasn't important. My brother wasn't important to him at all. I can't see how a man can give up on his children. I struggle with pcos myself so I know what it's like to be infertile. But for men like him to be making babies and just not even caring about nobody but himself infuriates me beyond belief. Yes I have anger towards my sperm donor. Like I said before I appreciate the man who raised me. But theres something missing and it's apart of me. Been that way for at least 26 years. There's no way for me to let him know my feelings bc he don't care. I had to uninvite him to my wedding bc I thought he wouldn't show like every other time. Idk how to get rid of him from my mind. I'm not to sure there is a way.