Final message from a volunteer sperm donor

I (31m) donated sperm free of any charge to be used for anybody enhancing their family. I just learned that I am the father of three children. All three are girls. A bit disappointed, however, I can get over it. I'm more concerned about three families now being without a father. It was easy to donate sperm, but now I feel like I'm part of the problem here. I can't help but feel I'm just another deadbeat dad.