You can keep your own iCloud storage when using Family Sharing if that’s what you mean. However, if you do decide to share the iCloud storage, all of your data and photos remain private in Family Sharing. None of the other family members will be able to see your photos.
What is Family Sharing? - Apple Support
One adult in your household — the family organizer — invites your family members. When family members join, they get instant access to the group’s subscriptions and content that are eligible for sharing. Each family member uses their own account, so everyone’s experience stays personalized and private.