If it's what you enjoy then it can't be bad. To each his own I always say..... (:
It's not bad to be alone all the time, but you need some company too to enjoy life more.
I like it too... Someone might think I'm weird.. But I enjoy the me-time. But if you enjoy being alone all the time that seems a little odd. Why not be with someone right now? ;)
I don't think there's anything wrong with being alone in fact lately I have been doing the same routine as you I just came from school and just run upstairs and lock myself in my room. I truly despise my carers and the other 2 kids that live in my care home. It just gets unbearable so I have ostracized myself away. Some days I get a message on Skype by some of my friends but I just generally can't muster up the energy to go meet with any of them since they live so far away. The noise in my house becomes unbearable and it all gets too much so I get cardboard and tape it on the windows blocking out the light that pierces my eyes and just wear my noise sensitive ear defenders in my dark quiet room. Occasionally I drink some Baileys while doing this.
The point im making is I know what you mean - it gets too much, and some isolation and sense deprivation is needed. There's nothing wrong with it. If anything I applaud you in making this decision much like I. Godspeed dude.
Well, when your depressed some people isolate them self so that could be it my friend ;-)