There are so many innocent children who do not have a home. It sounds like you are very loving, and giving children a good home would be a fulfilling purpose in life. You can determine if you are more Black or Asian and adopt children of that race to give them a sense of belonging together, and belonging with you.
If you have biological children with a partner of your ideal race, those children would still be race-mixed and at risk of inheriting the illnesses you mentioned.
Adopting or conceiving children would of course depend on your partner, so you can do a love working to find a good partner for you, and then talk it over with him about what path to take regarding children. If you meet a man who is also race-mixed, he might also see the merit in adopting.