With such a co-morbidity (what a word, eh?) you are probably best off doing what is right for you. Keeping yourself to yourself is not so bad for bipolar - it has more to do with personality, I think.
I know shut-ins who barely leave the house for months during their worst times, but they never suffer cabin fever, because it is not in their nature to do so. Another person might get frustrated with a couple of days without socialising. That's *their* personality.
Everyone is different. Don't take advice from a social butterfly who plays team sports, is on every committee, was voted most popular, and is the life of every party. Just because *they* are energised by other people, doesn't mean we all are.
I am one of the "loner" people. I live alone. I MUCH prefer it this way. I am in control of my thoughts, and get drained emotionally when I am constantly bombarded by other people's chatter.
I do have contact with workmates, friends, those in my church, and other people in society. But is is SO nice to come home and shut the door, and be me in my own thoughts.
Find *your* level of comfort, and live there. I am single (never married), and *I* am fine with it. I pity those who married, then regretted it. (My Mom took 30 years to find the courage to leave my Dad) I pity those who are lonely, and yearn for love. If I even get so much as a pick-up line aimed in my direction, I run away screaming. Well, not literally, but I have no intention of giving up my treasured solitude. I need it. It is my comfort zone. Yours too, by the sound of it. There is nothing wrong with that. And there is nothing so wrong as socialising more (or finding a partner) just because society says it is the norm.
In being alone, you are not alone.
