Hello John Mayer and welcome to Chordie.
OK, first off, we don't actually "post" songs to chordie. Chordie is a search engine which goes out to the interwebz and finds songs and lists them by artist or title. Chordie does not actually host songs. So having said that, here is a list of "your" songs that are currently accessible from chordie:
http://www.chordie.com/song.php/songart … l?sort=all
You are right: John Mayer is a very talented guitar player and some of his chord constructs are quite complex, but they don't necessarily have to be. Here are a couple of tips fo you.
1. Don't be afraid of the name of the chord. The complexity of a chord name does not mean the chord is complex. For example, a Bm7b5 is easier (for me anyway) to play than a Bm.
2. You can often get away with "cheating". For example, instead of playing A/C#, see if A will work in its place. Instead of E9 or E11 or E13, see if E7 will work instead.
3. Work on this song by song. If you have a specific song in mind and need help with it, post that request in the "Song Requests" section of the forum and you are more likley to get a helpful answer. Then move on to the next one.
Others can weigh in with their comments if they see fit. Good luck.