I'm probably not the best person to attempt to explain this, even though I am a he/him lesbian, but I'm going to give it a go and try to explain how I feel about it.
I'm female. I acknowledge that. However, I feel more comfortable using male pronouns. They just seem to fit me better, to explain me. I have always felt this way, just didn't know how to explain it. Male pronouns seem to fit me, even though I'm female... does that kind of make sense?