Name changed, as according to this thread, I'm unusual!
I am a white single parent, who adopted in my early thirties, a healthy, white baby. There is something that that baby more right for me than anyone else, an as a single adopter, you have to have your USP. That could be your ethnicity, a skill you have, or experience with a medical condition. I also have a birth child. Life is busy!
The rules re FtA have changed, and employees are entitled to take adoption leave right away for FtA, and don't have an unpaid part like it used to be, that's been improved.
However, FtA is a huge gamble with a birth child, and IMO, cruel.
I would second the 'wait' advice, but I didn't look at sperm donation. It wasn't right for me, and I'd have struggled to ask for help when I needed it, if I had made the child on my own, as I'd feel it was all my responsibility, does that make sense? Whereas adopting, I feel that while I do the bulk of the work, it's my whole support network who are invested.
I also got told it would stop me finding a man. But I'm not some sort of half human, waiting for a man. If a man comes along, then the right man will accept the decisions I've made for me, and my family. The idea that because I'm a woman, under 30, I must be in want of a man, just felt very Jane Austin to me!
Start looking in to it, start reading widely. Wait until your birth child can weather the storm of adopting a little bit, the older the better. But don't let your age stop you if it's what you want to do.
Not to be dismissive, but parenting in a couple is a different ball game to single parenting, in every way. So, finding it hard with two in a couple is quite different to the ways in which it's hard as a single parent. There are many pros to being a single parent, especially to a child who has additional needs, as adopted children do. You don't know what you're capable of until you do it. People who say 'I don't know how single parents do it!' are like those who say 'I don't know how you could adopt!'- a bit annoying!
Most people cope with their lot in life, really.