Is it normal to kiss your cousin?
Depends.It depends
A quick cheek kiss as a family greeting is normal in some families and cultures, while others find it awkward. A romantic kiss is a different matter: people have mixed feelings about it, and consent, age, family boundaries, and local laws matter.
If you mean a quick kiss on the cheek hello or goodbye, that’s an ordinary family greeting in some households and cultures. In others, even that would feel unusual—families have their own comfort levels.
If you mean a romantic kiss, people are more divided. Having a feeling or being curious doesn’t make you bad, but don’t assume your cousin feels the same: respect their boundaries, and make sure you’re both adults and aware of any local laws before acting on it.