This can be challenging, but you are allowed to maintain different rules and boundaries for your family.
One thing to keep in mind is that even if your child is not allowed on social media, they will likely still be able to figure out a way to access it if they really want to, and may be exposed to it by their friends regardless. You will need to communicate with and educate your child about social media even if they are not allowed access.
Remember that more restrictions may keep your child safe, but without open and honest communication with your child and having their trust they may seek to access these platforms anyway. They will then be less safe since they are now doing so without your guidance.
This is a difficult balance to find, but it is important for your child’s safety.
If you have the capacity and commitment, you can also connect with your child’s friends’ parents and come to an agreement about social media rules so that your child and their friends will not have different access to social media.