Ignore all the breathless media panic about Gmail passwords being exposed. See the Google Security Blog here: http://googleonlinesecurity.blogspot.com/2014/09/cleaning-up-after-password-dumps.html
Do follow the recommendations in the Google Blog: enable two-factor authentication, use a strong password, don’t use the same password, etc.
The only site to check if your email address has been ‘found’ is https://haveibeenpwned.com/ . This site is valid and honest.