There is an element of reframing it in your head that is necessary.
I had to cut contact with my mother (police and SS involvement due to her presenting a risk to my children), my dad died and my marriage broke up within 4 months. The last two happened within a fortnight of each other. So I really was on my own after that.
I had no choice but to put a positive spin on it. I had no support (no other family but a sibling who was worse than useless at the time and no friends due to various life shit and my MH during the preceding years) and so just had to get on with it. And obviously, single parenthood massively impacts on your ability to make and maintain friendships too.
So that's not to say it was easy! Or that I never got lonely. Or that I'd have chosen a single second of it but there were moments of light and, in those moments, I had to find the positives and make the best of it.
Eventually, it did feel better and now (12 years on) I'm engaged to someone else and living a happy and peaceful life. My overall memory of the last 12 years (when I have always been a single parent) is that they have been good because that's what I choose to focus on.
Are there times or moments, when the childen are in bed, say, that you can think about the life you want and ways to make that happen? Because that's the only way you are going to change things.
I know it's frustrating when people tell you to find the positives and you can't see them because it's not what you'd have chosen because all you want to do is scream that there aren't any.
I've been a single parent twice (clearly, I have historically had very bad taste in men!) The first time, I went to university and got a degree with a toddler in tow and the second time, I (eventually) joined a local.gigging band. My exh certainly wouldn't have encouraged that!
I'm only telling you this because I hope you can see that there can be a brighter future for you even if it's hard to see it right now. But it won't happen if you only focus on how shit it all is.
Because it is shit! There's no getting away from that. But it is also true that only you can change it.
I'm sorry if I've missed your children's ages but after a decade they could be in/approaching teenage years which usually gives.you more freedom. Perhaps focus on what you can do when that time comes? The only babysitter I had for my youngest child was my eldest child when he was old enough.
If there are additional reasons that make all of this impossible, then I'll agree, it is just really, really shit and no, none else will get any of it unless they've experienced it.
Take care.