I had both sides right from the start, but only used the subside for years as I felt rather confused by the whole thing which burst out unexpectedly in my mid twenties and felt one side was more than enough to get on with ;-)
After a number of years I became domme, feeling that the sub side was frustrating in that you were always depending on others, and I could not seem to find a good partner. Several other women experienced the same thing at that time.
Now I am in a relationship with another dom/switch, and I am sub with him, mostly, and domme with others.