I don't use a female voice per se.
I tried voice training with a great speech therapist off and on for two years. I noticed, as each passing month, I became more comfy in my skin and ability to pass, I worried less and less about my voice.
I don't have a low voice, so that helps, and when needed like answering the phone, I can switch to a higher voice.
Now, six years later, I dont care about my voice with my friends or even people I meet for the first time.
People see me, that's their first impression, voice is secondary to me.