The only thing preventing someone from trying to break into your email, is a strong password.
As such, it is important to use strong passwords and change them often. It is recommended that you use a combination of characters, upper case and lower case letters, as well as numbers. Do not make your password something simple or common, like a name or birthday. It is also a good habit to change your passwords monthly. Pick a day of the month and mark your calendar so that you change it every month or two regularly.
Although this can be a tedious task it will put you in the best situation to protect yourself.