Sorry. Here's to reply:
1. Unfriend them. No explanation needed. It's facebook, I'm sure that kind of thing happens all the time.
2. Gain confidence? Dress manly until Halloween. On Halloween, dress in the most over-the-top drag you can manage to get through the doorway in. Makeup included. Be a really annoying character. Let it be obvious that the only way you'll ever be female is in a costume. Everyone knows you can't live your whole life playing the wrong part. A stunt like this will help them get that that's what being female to you is.
3. What kind of support is it that you're looking to avoid needing from other people? If you're looking for validation that you're needed, volunteer somewhere. Tell them the proper names and pronouns, and then commence being useful.
If you need information, find a couple of books on researching things, then get a library card if you don't already have one. I find that volunteering once a week for a couple of hours really helps the need to socialize without actually socializing.
For needing friends, well, it depends on how far you're willing to go down that road. I would suggest still staying on a site like this, though. There was a point in time where I relied heavily on a pet fern- that's right. A plant was my friend. A little baby one I got from the craft store.
Reading fiction can also help, especially if you find a book with good characterization, as you can imagine having conversations with the characters where everyone is snarky or supportive, depending on what you need at the time.
BSing on online games can be good to.
Talking to stuffed animals.
Artsy hobbies can be good at making the time go by in a manner where you don't need words.
Conversations with yourself.
Hell, recording your voice on your electronic pocket watch (some people call them "cell phones") and listening to it can be fun, especially if you use funny accents.
(This is rather my forte here, as I only feel the need to talk to my flesh-and-blood friends maybe once every six months or so).
Maybe a hedgehogs? Hedgehogs are cool. Or a gerbil. (You said small apartment, but I thought I'd still suggest a couple tinies.)