I've been in boy mode during 1.5 yrs of hormones. Not mentally, but physically. Today a friend said I look like a butch lesbian. Sometimes I feel like a guy, sometimes I feel like a girl. Normal for a lot of people. (genderqueer, genderfluid).
Sometimes I bind my breasts, sometimes I don't. Am I less trans because I feel more masculine some days? Nope.
I think the fact that I like girls more than guys (sexually) makes me more of a lesbian (genderfluid but generally female). And as a lesbian I can be as butch, fem, whatever I want.
My therapist told me to start dressing as female. In my head, the thought "what is dressing as female, many cis women dress in men's clothes, many mix men's and women's clothes". So I said I would. But in all honesty me getting all "girl'd up" isn't me. So I won't do it. If I feel like it, I will.
So if you feel like being in guy mode, don't let anyone stop you. Don't question yourself too much.