Hi Lottie,
Thought I'd share my story as similar to yours. I'm 35 and single. I've always wanted to be a mother, and I always knew that it was more important to me to be a mother than meeting a man. I used to always say I would rather be a single mother than never be a mum at all. It was one of life's non negotiables for me!
Even though I've always said that, I still found it difficult to make the decision to do it alone. I felt it was selfish, was it fair for the child not to have a dad, how would I financially support it etc. I did a lot of research, there are some great books on amazon and a couple of documentaries out there. Maybe read up on it before ruling it out? Plus do research on working tax credits and child tax credits. You may be surprised what you can get. Plus remember most people even in couples worry about affording children, but it's not usually as bad as you think and if we all waited until we could truly afford it then we would never have children.
Anyway I finally made the decision 18 months ago, when I was 34, to go down the donor route. I realised even if I met someone at 34, I didn't want to rush into having kids with someone so it would have been a few more years and what if it still didn't work out!it was too big a risk for me, no man was worth that risk, I have the rest of my life to meet someone without the pressure of a ticking clock.
Anyway, last year I had IVF and I'm now 20 weeks pregnant, with two frozen embryos still, hopefully for a future sibling too. I do have sad moments but there are also some great advantages. I've seen friends in bad relationships and that can damage children more than being with a single parent. In fact studies have shown that children growing up in a single parent home (from the beginning) are just as happy and secure as two parent homes. It's the breakdown of relationships that can cause upset. All children want and need is love and security.
Hope it helps. Guess what I'm trying to say is please don't rule anything out without doing some research. YANBU to be sad but you do have options to make a choice that is right for you xx