What does it mean to be a "democrat"?

[Aegon]

I'm a registered Democrat only because New York has closed primaries. Otherwise I'd have registered as an Independent.

I hate political parties. I hate identity politics. It only serves as a way to oversimplify the issues and divide the public. I don't like calling myself a Democrat because I don't like the left-wing establishment in this country. I don't want to be known as somebody who supports the DNC, because I don't. But I also tend to distance myself from the liberals because I don't agree with many of the things they say. I think there has been a liberal intolerance in this country, and that intolerance has led to a Donald Trump presidency. On the other hand, I could never ever be a Republican; I think I have a fundamental disagreement with every single part of their platform.

So I don't want to identify with the Democrats, the liberals, or the Republicans. Where does that leave me?

EDIT: I like to think of "progressives" as somewhere between liberals and establishment Dems. I wouldn't mind being in that camp.