My experiences were largely the same, though I didn't make a conscious effort to not think about stuff, I simply didn't take the time to explore my identity until later.
I'd rather avoid a discussion of terms, but I will say that while gender non-conforming does fit, its not a term I would use to describe myself, because I very much feel that I am a part of the gender binary. While I may fluctuate between male and female, I always have a solid grasp on where I fall within those two terms. If for example, I somedays felt that I was a third or fourth gender entirely, I would be more willing to describe myself as being outside the binary, or gender non conforming.
However, I get what you're saying. I did not simply decide one day that I was going to become gender fluid. It was always there, but I simply wasn't ready to accept it until I was in college.