Is this just a logic or experience about mind(reality)?

While doing self enquiry kind of meditation(also doing vipassana) there is feel of understanding/experience/logic that make myself convinced(but not strongly) that "me" is not the thoughts or the body or sensual experience. I don't continuously feel this, but I find concentration, calmness etc getting better. What is this am I experiencing? How to go beyond this? And some teachings says that if you can disassociate ourself from mind and body then we can experience oneness(or conciousness), but I don't experience oneness or anything that I haven't experience before except the feeling of dissociation, why?