How Much is Too Much "Alone Time"?

About a year ago my fiance and I came up with the nickname "Kit Kat" for me. The thing is, it's more associated with a cat than a candy bar. I can be sweet, but I can also scratch. You see, I absolutely LOVE being alone. So much so that I think it's become a bit of a problem. Or...more than a bit of a problem.

Why do I like being alone so much? Because I can do things on my terms. I cook for myself. I do activities that I want to do. I listen to my favorite music. I wake up and go to bed when I want. And there's no annoying chitter-chatter ringing in my ears. It's all me and it's all good.

I realize how selfish that is.

How did this happen? Well, I spent a lot of time alone during college. I loved not having a room mate because I was a very atypical college student. I didn't like to go to parties or drink alcohol or be in a crowd. I now know that college isn't all about partying and drinking, but back then I sort of adopted this attitude that I was "above that." 

I realize how selfish that is.

Why is it a problem? Isn't it obvious? I've been distancing myself from others and isolating myself for so long. Now being alone is not only normal for me; it's my preferred state of being. But guess what? I'm getting married. I'm going to be living with another person all the time. We're going to do a lot of things together: cook, eat, sleep, rest, etc. And while my fiance knows that I need my quiet/alone time, there are still going to be times where he'll want to be with me. And that's totally fine; I want to be with him too! Except when I don't want to be.

I realize how selfish that is.

So my question is: how do I become social again? I kind of know what I need to do, but I'm just not pushing myself to do it. We really do spend our time doing things that we value, and for me, those things are very solitary: reading, writing, art, cooking. Even bicycling I prefer to do alone. But I also value my fiance, and I think I can start with letting go of "me, me, me" and focus on the relationship of "us". 

Wish me luck.