That self-reported data backs up this review of research in 2010. 12 years later and no one seems to have paid attention.
slate.com/human-interest/2010/06/new-study-shows-sperm-donor-kids-suffer.html
"Nearly half of donor offspring, and more than half of adoptees, agree, “It is better to adopt than to use donated sperm or eggs to have a child.”
"Two-thirds of adult donor offspring agree with the statement “My sperm donor is half of who I am.” Nearly half are disturbed that money was involved in their conception. More than half say that when they see someone who resembles them, they wonder if they are related. About two-thirds affirm the right of donor offspring to know the truth about their origins."
"About half of them have concerns about or serious objections to donor conception itself, even if parents tell their children the truth."
"Donor offspring may have legal and social parents who take a variety of forms—single, coupled, gay, straight. But they also have, like everyone else, a biological father and mother, two people whose very beings are found in the child’s own body and seen in his or her own image reflected in the mirror."
"The study of 18- to 45-year-olds includes 485 who were conceived via sperm donation, 562 adopted as infants, and 563 raised by their biological parents."