Listen to your body. if 10K is too much, then so be it. Maybe your running group can split into two sub groups.
(The wording of this question, on casual reading, was alarming and easy to misinterpret. I initially though you were talking about hating folks from a specific ethnic group and started to get my hackles up.)
The problem is that many people will object to your dropping out after 5K, while they go on to do a 10K.
Some people just have issues with a mixed race.