Man everybody seems to have that problem.
Change your password periodically. And use a strong password consisting of upper and lower-case chars, mixed with numbers.
Example: Say your password was ThisIsMyPassword
A strong password would be: Th1s1sMyP2ssw0rd (2 representing @, which means AT, however it essentially is showing the "shape" of a lowercase "a" and so forth.
Learn password etiquette people!
Your password doesn't have to make sense to you either, this is only used so it's easier for you to remember. Your password can be completely random and be very strong (d8d74j6kd9), however if you can't remember it, it's useless.
Change your password people! And don't use the same password for every site that you use, use atleast 3-5 different passwords.