You ask if I believe in nothing. It's a very good question.
My ultimate aim is to "believe nothing", which is a bit different than "believing in nothing." IMO the former is a statement about my belief system, while the latter is a statement about my value system. Beliefs and values are normally very tightly coupled - for most people all values are based on some underlying belief(s).
I definitely still keep values, because they seem to be necessary for the proper functioning of the body-mind in a dualistic world where there are apparently other people. On the other hand, I believe that all beliefs are unjustifiable, so I try to recognize as many of my own beliefs as possible, discard the ones I can, and hold the others as lightly as possible.
I attempt to decouple my value system as much as possible from an underlying belief system. Whenever I can do that, I feel an expanded possibility for free choice in the thoughts and behavior that express my values. To do this I need to bring my beliefs up from the unconscious basement where we all normally house them, and into the sunlight of consciousness. I apply a lot of introspective horsepower to that task - every action, thought or feeling usually has a belief or several that drive it. Each of them are fair game to be recognized and relinquished.
So for example while I 'believe in' the value of justice I don't believe that "the moral arc of the universe bends towards justice" to use MLK's phrase, or that there can be a general expectation of fairness in human relations. However, I behave 'as if' I believe those things, at least sometimes under some circumstances.