yes and no. or, wait: i don't know.
when i started running seriously (age 13), it was great, exciting, gave me confidence. at that point, i wasn't overly serious though; i ran highschool XC and only ran during practice and meets. being able to run 3 miles was something i was proud of. ...until i decided i wanted to work a little harder so i could "get good."
when i started to get good, i got obsessive, developed an eating disorder and went into hysterics when i got injured and couldn't run; that's when eating got out of control.
running has grown into somewhat of an addiction: psychological? physical? i'm not sure which.
senior year of college i was running up to 4 times a day until i got injured (surprise).
i decided i was DONE with running when college ended; i was very out of balance at that point, having thought about suicide when i missed my conference meet b/c of injury, and i saw running as a horribly negative thing.
when i came to grad school (not running at all), a lot of things went wrong, and i wasn't happy with my life at all. it wasn't until i started to run again that my whold mood became more positive, i got control of my bulimic habits and started to "deal" with life. when school was stressing everyone else out, i was able to keep my cool b/c i had running to focus on when i got overwhelmed by school. in a sense, running and good nutrition helped me to take care of myself and keep perspective during finals.
but now, i'm starting to get back into shape, and i'm starting to verge on obsessinon again.
What i have learned:
i've come to realize the importance of days off and not running yourself into the ground b/c too much running can lead to the "addiction."
(in fact, i've read some research on the "running addiction" and there is a biological basis; some scientist compared the neurological activity caused by withdrawal from running to that of withdrawal from cocaine (on a much lesser scale, of course).
in short, running is good, but it needs to be balanced by other things...easier said than done. aside from being a physical "addiction" it can become a problem for those who define themselves solely based upon running (i see this as especially a problem for talented young runners). i was a confused adolescent when i started running, and i had low self-esteem (which is not uncommon for 13 or 14 year old girls).
As for relationships, the best i ever had was (about a year ago) with another "obsessive" runner; we could relate to each other very well b/c we shared the passion for running and shared the experience of being criticized by others for the high priority we placed on getting our runs in.
i have a theory that some runners are socially awkward and uncomfortable in social gatherings, and that is why they are drawn to running. i was painfully shy when i started running.
However, i would not put myself into the "introverted" category at all now that i am 22; i'm quite social, so it becomes challenging to maintain social ties with others when it means missing training.
....for instance, it is Saturday night, and i'm trading the chance to go out for a speedworkout.