With spirituality comes morality. Morality is doing what is right, regardless of what you are told. Religion is doing what you are told, regardless of what is right. Spiritual people are not "godless." We just happen to honour the "god" in all of us.
Mindfulness tools are scientifically proven to calm down your mind and slow down habitual thinking patterns, those that often lead to insecure, negative thoughts or contribute to low self-esteem. Here's a list of mindfulness techniques.