There's a book which I found really helpful for psychological issues I've had about guitar practice, performing, composing & so on. It's called
Effortless Mastery by Kenny Werner
Effortless Mastery - Book/CD By Kenny Werner: Jazzbooks.com
It's really fun to read regardless of how serious or non-serious you feel about music, guitar, or life in general. It's definitely helped me for situations where I feel intimidated, or start taking myself too seriously, get too perfectionistic, or just forget to relax & have fun.
My girlfriend & I both play guitar. It's really nice to have that in common, and we often discuss our musical difficulties with each other - like not being able to practice like we want to, or not taking the time to write more often, & such. It really helps to have someone to talk with.