If you really want to feel small and insignificant today, take a look at this sliding scale of the universe. The scale takes us all the way from the building blocks of matter to the edge of the visible universe.
http://www.primaxstudio.com/stuff/scale_of_universe/
The best way I can illustrate is to take a rubber balloon and blow it up. Now that I have an expanded rubber balloon I'm going to ask, what is causing the shape of the balloon? And, is that cause acting on the balloon from somewhere in the past? Or is the air in the balloon and the tendency of the balloon to collapse co-acting on each other to form the shape of the balloon in real-time, in the present moment? Or does the air and balloon variously react to each other in a serial time sequence as causal-chain determinism would suggest?