Why don't you try to make a method for making different passwords for different sites that only you could really figure out. Here's a little example.
First, you memorize a poem (or at the very least, know the title of a famous one so you can look it up).
Then, look at the first letter of the site you're registering for. 'L' for Legions. Find the first time this letter comes up in the poem at the start of a word (if it doesn't come up, find the first time it comes up in any word, and if that doesn't work, use the next letter of the site; it would be an 'e' in this case). long in line 3. Now, take the first 6 letters of the subsequent words. isaldo. Put them together, and this is your password (use all lowercase or all caps or whatever combination you want.
l3isaldo
If you ever forget your password, you just figure it out. Once you get good at figuring it out, it won't take much time at all to decode your password. You'll also have different passwords for most things you do. You can also change the algorithm for your password so it will be more diverse anyway you please.