I am interested in pursuing a Masters/PhD program in the US but I do not have a bachelor’s degree My interest is in the field of Psychology/Neuroscience. I am currently a monk/meditation teacher and I dedicated my life to helping people find inner happiness and peace 20 years ago when I was still in high school. Will this vast experience of working with people for 2 decades qualify as field experience and earn me an entry into a graduate/PhD program? I have gained spiritual insights in the nature of the mind and emotions; what I am now looking for is the scientific backing for all my experiences. I want to blend spirituality, Psychology  and neuroscience and develop effectiveness be methods for happiness and inner peace. I read some replies that it is indeed possible to directly enroll for a graduate program. Could someone please guide me how do I go about it? I live in India and I am planning to appear for GRE and TOEFL in August this year.
Your experience is not in science, why would you have equivalence in any science related bachelor degree? 

I am completely sure that your experience on religion/spirituality/self-help/alternative therapies/human interactions will not guarantee equivalence in psychology or neuroscience related degrees. The knowledge expected from a person holding one of these degrees is completely different.

However, instead of pursuing a PhD why not engage in a bachelor course? The bachelor will give to you many tools of which you will need to work in a PhD.