I can see if you have lots of friends/social connections that you'd be happier. I would think if you had lots of connections more of your needs/wants could be met. Example: your friend, Mary loves to bike, but has no interest in your love of horticulture, so for that you talk to Joe. Well, your friend Sam shares your love of Indian food, etc. etc. With a smaller social circle it's probably less likely you'll have someone for all your needs/interests.

However, you can count me among the introverts. Cycling club meeting once a month is about all the socialization I can stand.