I am not sure. I grew up as an only child so I had to fend for myself as far as being "entertained" went. I live alone by choice now, and I am pretty happy with it except these nagging times when I wish I had a roommate or something..... so I could *gasp* spend time with someone. I rarely get bored though.. there is always something I can do to occupy my time. A project, a book, a nap, a walk, a gaze at the clouds moment.
When I took the MBTI test when I was 18, I remember testing fairly high on the introvert scale. I primarily get my energy from being alone, but after I leave a party with friends I feel quite exhilierated and energized. After a long day at work (like right now) I am feeling low energy and that I want a nap. But after about 10 minutes of being alone at home, I know that I will be feeling more peppy.
Now I feel all topsy - turvy.
I might have to dig up my old MBTI sheet and see what I scored as.... I think the only "slight" preference on my sheet was the P/J scale. I scored a 15 on the P side. (52 was the extreme for either side, and 0 was the middle area.... My dad took it and scored a 51 on Thinking.)