Immature?
IMMATURE?!
You have suffered a terrible loss SirGod, I don't have to tell you that. A little suspension of reality is not only healty, in your case it's required. You need some time and seperation to deal with the sucking chest wound you have in your soul.
Even Doctors give morphene to patience under surgery. I see no reason why you should feel exempt from that precedent. The only caution I would say is make sure you don't get hooked on it, you have to come back.
But if you have made it this far you already know that, moreover, you won't let yourself do that for your sister's sake.
Summary: Feel no guilt about the time away from the house. You have already shown great strength in this matter, and it is time you focused on healing.
Take care,
Merlin