Why are you searching for your birth mother? Aren’t you adoptive parents good enough for you?
Wanting to know the people who share your blood and gave you life has nothing at all to do with a persons feelings about their adoptive parents. Do you only have limited space in your heart? Not every birth mother simply chose to sign away their rights... especially way back then when options weren't as available as they are today. And fyi, once in a while not so great people adopt too, so not 100% of adoptive parents are, as you say 'good enough'. Don't taint a strangers journey with your own insecurities.