As for my opinion, I think making the decision to become a parent is a great thing, no matter wether it being in a relationship or not. I also appreciate those who have children bc they are keeping our society alive and thriving (does this sound archaical? Don't know...)
I also know someone who so-to-say accidently became mother at age 41... she considered abortion due to fear the baby would be disabled. It wasn't.
But, for the waiting thing, even if you'd happen to find the fish in the sea, it is only reasonable to wait a few years to be sure you really fit together, and then there is the question wether your partner wants a baby too....
I think advicing you "to wait" (in the hope to find a "daddy"?) is implying that one can't be a mother on one's own, and I simply think that's not true. I think that having a single mother who gives you all the love you need and supports you and stuff is better than having a dysfunctional family.... I grew up in a classical family and it was very damaging for me. I think if I had had a single mother who in contrast to both of my parents had given me what I needed as a child (emotionally), I would have ended up better.
So... you're getting my point. I don't think that having two parents is a key- or even necessary component of a happy childhood.
I also agree with shezbut on that you should think about your emotional and practical ressources for deciding wether to have a child or not. But this ressources don't have to come in shape of a partner.... just adding my opinion. I hope it brought on some good ideas!