Virus

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Even though iPhones themselves cannot get viruses, there are plenty of scams that try to convince you to reveal your Apple ID and other personal information. They are very common and people succumb to them every day.

Here are a few Apple Support documents you may find helpful toward protecting that digital identity:

Security and your Apple ID - Apple Support

Make sure that each family member has a unique Apple ID - Apple Support

Two-factor authentication for Apple ID - Apple Support

Social media sites typically use just a name and password to log in, so if someone discovers those credentials they effectively become "you". If those sites offer the equivalent two-factor authentication, use it.

There are no viruses that affect iPhones. Please start by describing what's wrong with your iPhone.