Reddit mentions of The Mindful Path through Shyness: How Mindfulness and Compassion Can Help Free You from Social Anxiety, Fear, and Avoidance

http://www.amazon.com/The-Mindful-Path-through-Shyness/dp/1572246502

This book relates the two.

I read a book called The Mindful Path Through Shyness and it helped me a lot with these issues. It goes into mindfulness meditation, which helped me to see thoughts as just thoughts, not to take them too seriously, and not to fight them. It also talks about compassion/loving kindness. Turns out cultivating compassion for others, and especially for yourself, is really helpful for social anxiety and low self esteem and happiness in general.

Meditation won't cure you in a few days or even weeks, so be patient. Meditation alone isn't enough either. You need be responsible for your improvement and take courageous action. Improving yourself will be challenging - but the more you meditate, the easier it will be.

I've been taught that one's ability to trust is determined by one's experiences during childhood. That doesn't mean one can't change through conscious effort however. Since you are now aware of your tendency to be suspicious, you can think through situations that come up with that in mind. With some effort, I believe you can work through this yourself. All it requires is consistent mindfulness. This book might help.