"Too much work and too much energy kill a man just as effectively as too much assorted vice or too much drink"

I have realized a lot about myself and my life lately.
Things I thought I wanted simply do not cut it.
I envisioned a lot of my life on my own, traveling and learning, but that doesn't seem enough. I wanted my career to come first. I've worked hard to earn my education and I don't want it to go to waste just to become a soccer mom homemaker. I thought that I could handle being by myself as long as I filled my time with school and work.
But, at the end of the day, being by myself isn't good enough. I didn't want to share my life, it's mine! But what an awful fate I assigned myself.
I appreciate independence.
But what good is a career, travels, and money with no one else to share it with?
I really had little faith in love and relationships (outside platonic).
It simply didn't seem like they would do me any good. Sure, in the aftermath of a three and a half year relationship I really wonder if it is worth it.
But I also wonder if shoving my face into the grindstone was worth what it cost me, even with the best intentions.