Okay, got lots of thoughts here...
I was 20 when I got in my first relationship, so I guess I don't fit here... but I have a lot of friends in this situation and I was probably on my way to it as well. I kind of made myself get a boyfriend as a junior in college. I did care about him a lot, but there was a lot of drama surrounding the situation that probably would have made me pass him up 9 times out of 10... but back then, I figured it was time to have a relationship, so I gave it a go.
Anyway, I think this situation is becoming a lot more common. Because we no longer live in a society in which women (even the shy ones) would meet a nice shy boy at school or church and could still end up with a partner, you now have situations where women who are shy/studious or just focused on education/career can end up approaching their 30s without being in a relationship.
On one hand, I think it's GREAT that these women avoided the ridiculousness of high school relationships. I don't mean just the heartbreak -- I mean the fact that these 18-19-year-olds these days really don't have all that much RELATIONSHIP experience. From what I hear, most of these girls might have had a "boyfriend" for a few years, but have no idea what it means to go on a date and be courted. They just hang out at someone's dorm/house/apartment and have sex. Shoot, I hear a lot of college "relationship" are like this these days... again, that's not the experience I find all that valuable... this is why you've got women in their 30s (sometimes with kids) who haven't experienced a relationship in which they are pursued and courted!
On the other hand, it eventually becomes unproductive to continue talking about all the heartache and heartbreak that you saved yourself from by not having a relationship. I think the poster YankeeCandle made an excellent post about this in a different thread. Yes, there are negatives to relationships (break ups, etc.), but by not having any, you also miss out on the opportunity to love, to be loved, to care for another person, to learn how to "relate" to someone on a level completely different from the level in which you'd relate to a good friend or a family member. These are important personal developments that we should experience, and I can see something "missing" when I meet older people who've spent their lives without having been in serious romantic relationships. There is an emotional immaturity there that I can't quite describe, but I know it when I see it.
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