At 24 I was feeling a certain biological clock - urge, to get married. It wasn't until I came to a point in my mind that I would be happy being single my whole life if that was the case... that I ended up tripping over the guy I ended up marrying. At that time I thought that it was something like "a watched pot never boils." Who knows if that's the case. Perhaps, if/when you are able to move beyond this feeling that you might end up finding the right guy and finding that you do choose to have a child or children. I doubt you would be as poor a parent as you think. In my experience, the people who are the most self-critical (within reason of course) are the most open to learning and try harder to do their best. A parent who is willing to learn and try is the most a child can hope for.
On the other hand. Choosing not to have a child to choose a career, or to even just wait for children is admirable IMHO. Our population is growing so much and there are so many valuable ways of contributing to society that parenting is not an absolute must. You will have urges... many more than you have experienced and like the one you are having now. My tubes were tied several years ago but I still have urges, wishing I could get pregnant and have a little boy. When I think about it long enough I am content though. That's probably the biggest question you'll have to answer. Do you ever come to a point, between urges, where you are content with your decision? If not then you may want to rethink things and many change your plans or path.
Good luck.
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"Always learn the rules so that you can break them properly." Dalai Lama
My Karma just ran over your Dogma.
