Sometimes you have to take a leap of faith to make a good decision. While it's possible to never leave the house these days, it's highly unlikely.
I started the same way and I think it's probably pretty common. It takes time to work through this after a lifetime of being reminded how wrong it is. It starts a little here and there, rushing to cover it up. After a while you start to live that way all the time at home and change to walk out the door. Soon you get tired of changing all the time and work up the courage to do little things like getting the mail, walking the dog, walking to the car. After a while, you realize nobody seems to care or if they do, they aren't mean enough to say anything to you and you start to try meeting up with friends as the real you, maybe some family members too.
That's when it really took off for me, when I started presenting that way to friends. They helped provide the courage I needed to do normal everyday things as myself, like going to the mall, getting gas, going to a restaurant, etc. Eventually I found the courage to do those things without them there simply because I had to. You're not going to know if you really need a transition if you only dress at home. It's scary, but you have to get out there. You will need to interact with society post transition and the only way to be sure you can handle that, is to actually try it.