I get it. You were expecting one future and now you have to adjust to another. Regardless of whether your reduced circumstances are ‘adequate’ (and of course you already know they could be worse) they aren’t what you signed up for, and that takes adjustment.
Although seeing what other people have is hard, I’m not sure comparing yourself to your friends is so much the issue here, as comparing where you are to where you expected to be.
I had expected not to need to work again, and now I do. Once I do, there is no going back. I’ll lose that freedom for good, even into retirement. It’s not the money, or that I’m too good to work, but I valued the time and flexibility more than I can say.
I wasn’t particularly well off. I chose to have that time and flexibility and a below-average salary because it was more important to me. And knowing there will still be nothing spare for nice things is hard. And worrying. I don’t mind driving an old banger, but sooner or later it will need replacing. Or the windows will. Or the garden fence. And when they do, I will have to have the cheapest thing I can get. I don’t mind that my family have fancy hot tubs and Teslas. I don’t want them. I’d love a new kitchen (this one is a terrible layout and uncomfortably high for me and I bought the house expecting to replace it right away) but I can’t even hope to save for it, even going without treats or holidays for years and years. I have a certain amount of capital and if I spend it, I’ll never build it again. (I go back a forth on the kitchen. I want it, but I don’t need it. But then it makes my back hurt, so maybe I do need it). See, I’m a bit stuck too. But I’ll figure out with some kindness and hand holding, and so will you (unlike others I don’t believe people who have more than I in some areas don’t deserve kindness at all!). While
most people do move on, it takes time to adjust. Give yourself time. Don’t expect to figure it all out today.
Things might change for me (although I really can’t see how) but they will definitely change for you, because your child will grow. Having young children in expensive childcare is a season. It passes, although it doesn’t feel like it while you are in it because it’s so all consuming. You prioritise them now, and your career later. Most single parents do repartner (my view of positively preferring to be single is unusual in my experience). Feeling stuck and trapped is a common reaction to a change you didn’t choose.
Definitely get some counselling to help you adjust. Check if you are entitled to any help (I’m not, so I know how that feels) and chase your child’s father for maintenance. He should support them financially, and that should free up some money for you. It’s not to save for them. It’s to spend on their needs. You save for them out of what’s left if you choose, AFTER you have had some non-essentials too. Try to expand your circle of friends to include people in more varied walks of life. The normal they have isn’t your normal just now and it will help to have friends with common experiences.
Everything will be ok in the end. If it’s not ok, it’s not the end.