Q: If I´m part of Apple familiy, how can I avoid seeing shared pictures by other family members?

Ivan, the following articles gives you instructions of Family Sharing.

Share purchased content with Family Sharing - Apple Support

Set up Family Sharing - Apple Support

The answer could be to ask your other family members to not add the photos to the shared album. Of course, this would prevent all, not just you, from seeing the photos, not really what you wanted, I am afraid. I don't think there is a way of excluding just you from the photos but keeping the others on the sync. The first step would work on a family of 2 but not a larger one.... Hope this helps...

Carlos