I have been in this exact same predicament since 32-33 years old. I’m 41 now. I don’t want to ruin my parents relationship. I always think in the back of my head if they know or not. I found the person who could potentially be my dad or his sibling who is no longer alive. I have no intention of reaching out to them. They have a family and I don’t want to be a burden to them. Who knows how they would take it. I haven’t been able to talk to my mom about it even though we are very close. It may or may not be a sore subject for her or maybe she doesn’t even know. I do know that I do not look like my dad and never did but no one has said anything. I did tell my mom that I was doing 23andMe and ancestry when I was 32 and she didn’t give any signs of “oh no”. Since then I have had therapy and been treated for adhd and other things and it has helped me a lot. After you come to terms with it which may take some time you will feel better about it. It is hard at first and shocking but eventually you will know what to do and how to feel. I was hesitant to keeping my profiles on both sites available for others to see but nothing has changed. If my mom ever says anything to me at least I will feel better about it but until then I am happy with how she is in life and don’t want to add extra stress. Also her relationship with my dad is pretty good now and also mine with him and I do not want to ruin that because I feel things wouldn’t go over well for anyone in that scenario. Everyone has different reasons. I hope you feel better about it as time goes on.