I have taught nursing students with no experience whatsoever along with those who had extensive experience as CNAs, etc. The CNAs were often rather smug and condescending to the other students about how much they knew and how easy clinical was going to be for them, etc., but they had only a very brief, limited advantage. The stuff you learn in nursing school is so much more and so far beyond CNA-level stuff that everyone is quickly back in the same boat.
When ever this question comes up, I always remember my first undergrad experience (long before I thought about nursing). I completed French 101 Fall semester, starting from scratch since I had no language in high school, and was surprised, on the first day of French 102, to find that the class was much larger -- we had a whole new group of students, and it turned out
they were all kids who had had four years of high school French -- four
years of
high school French equalled one
semester of
college French. Same principal -- you may start at a slight disadvantage (with no experience) in the clinicals, if only in terms of basic "comfort level" with doing things to other people's bodies

, but that won't last long!
Best wishes to all of you --
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