Hello Lalo29,
Thanks for using Apple Support Communities and welcome to the iPhone family!
I see that you are having an issue with passwords for Gmail and Facebook and that someone may have access to those credentials. I know how important it is to make sure that you are the only person that has access to your accounts. I'll be more than happy to assist you with this.
First, if you think that someone is using your username and password for these services, the most important thing to do is make sure that you update the password to something very secure. The following sites will help you:
Facebook - How do I change my password?
Change your Google Account password
Next, use the iPhone Help guide and learn how to control the Privacy and Security and saved password settings of your iPhone, specifically, this section:
Privacy and security
You can adjust Safari settings to keep your browsing activities to yourself and protect yourself from malicious websites.
Want to keep a low profile? Go to Settings > Safari, then turn on Do Not Track. Safari will ask websites you visit not to track your browsing, but beware—a website can choose not to honor the request.
Control cookies. Go to Settings > Safari > Block Cookies. To remove cookies already on iPhone, go to Settings > Safari > Clear History and Website Data.
Let Safari create secure passwords and store them for you. Tap the password field when creating a new account, tap Suggest Password, then Safari will suggest a password for you to use.

View your saved passwords. Go to Settings > Safari > Passwords, then enter your iPhone passcode or use Touch ID.
Erase your browsing history and data from iPhone. Go to Settings > Safari > Clear History and Website Data.
Visit sites without making history. Tap
, then tap Private. Sites you visit won’t appear in iCloud Tabs or be added to History on your iPhone. To put away your private sites, tap
, then tap Private again. You can close the pages, or keep them for viewing the next time you use Private Browsing Mode.
Watch for suspicious websites. Go to Settings > Safari, then turn on Fraudulent Website Warning.
Additionally, use the following resources below to see how iCloud Keychain can keep passwords and more updated across all Apple devices:
Frequently asked questions about iCloud Keychain
Get help using iCloud Keychain​
Enjoy your new iPhone!