I've been single for 18 years now - since I was 26. I do remember feeling particularly lonely in my early 30s, as that was when most of my friends had got married and were starting families. My social life disappeared and since I was self employed at the time and WFH, the opportunities to make new friends to socialise with/meet men were few and far between.
At age 33, having been single for 7 years, I decided that I didn't want to miss out on the opportunity of having a child, so decided to go it solo. Totally appreciate that it is expensive to do this - fortunately I had some savings, and I went overseas where it was much cheaper.
I had my ds at age 34 and I haven't felt lonely since. He gave my life a purpose I did feel was missing before. I haven't dated since before I decided to try for a baby - so over 10 years ago now.
I did contemplate it last year, as I do occasionally think the idea of a Sunday boyfriend might be nice. But in all honesty, I don't feel that my life is lacking much now, and that including a man in it would potentially take things away from it. I concluded that the gains wouldn't outweigh the losses for me personally, so staying happily single for the foreseeable.
It may be that as my ds grows up and becomes more independent I might begin to feel lonely. But I think I've become so used to my own company I may just stay this way! I'm an introvert, so the thought of having someone in my life/house/bed makes me come out in a rash!
If I were to offer some advice, I would say that at 33 if having a child is something that is important to you then don't let being single stop you from pursuing it seriously. Look into all options - you might find options that make it more affordable for you.
But also, don't give up on finding a partner to share your life with if that's equally something you want. Other posters have proved that it's more than possible to come back from being long term single.
The best thing you can do is take advantage of all the things that being single can give you right now - freedom, the whole bed to yourself, etc.