It's... complicated.
Crossdressing has some facets.
Mostly, it comes down to, do you present as a man, or as a tomboy, or a girl that just wears comfy clothing? Another possible facet is, do you get a sexual thrill or pleasure from crossdressing?
Having known you in real life, I would say that just wearing man pants and my shirts doesn't really count as crossdressing par se. But, that isn't the be all, end all of it. 😛 Most likely, no, you aren't a crossdresser. If you were to lower your voice, bind your breasts, and maybe even get a packy, then yes, you'd be a crossdresser. ^_^
