I have spells where I feel like this, except without feeling guilty! 😂
You're burned out and bored.
Turn the guilt inside out and recognise it as frustration. This will free up a lot of energy. Use that energy to fo some little bits of things that keep you connected to who you are.
I have a DC with SEN who needs A LOT of undivided attention from me, like 24/7, and often wants to control everything I do, and monologues at me every waking moment about Minecraft or Roblox.
I have days where I think I could lie down and cry for a thousand years, I'm so tired and overstimulated.
I spent about 5 minutes once comparing myself unfavourably to all the endlessly patient and selfless SEN mums of IG and felt absolutely dreadful, before snapping out of it and thinking, this is fucking hard, and I haven't spent this much of my life being a person in my own right to be able to just chuck it all away without a regret.
It's completely normal to find it hard, and to want yourself back, and not to enjoy what small children enjoy.
Another thing nobody tells you: the parents who do a lot of Lego and baking and crafts tend to do it because they enjoy it themselves (or don't mind all that much doing it), and have kids who actively enjoy it. It's a nice way for all parties to spend time.
If neither you nor your kids are enthusiastic about Lego or baking or crafts, it's not going to be the low-effort parenting hack we're led to believe, but a messy, tearful, joyless waste of time. Turns out DC and I both hated all those structured activities, but I was pretty good at pretend play with teds, and it didn't make me want to stab my eyes out with crayons by the end of the day.
There will be one or two activities you and your kids can do together for short periods of time without your dying inside of boredom. It's just a matter of finding what they are. PS - it doesn't matter if they involve screens.
Furthermore: kids can endure having a parent who isn't 100% present and engaged all the time.
Many of us were raised by bored housewives, off their tits on Valium, and we turned out all right. Or we were chucked out of the house after breakfast and told not to come home until dinner. This generation is fixated on being obsessively attentive to one's kids in a way that's neither healthy nor realistic, IMO, and it shits all over mums.
Own your frustration rather than turning it against yourself as guilt, take that frustrated energy and channel it towards something that supports your own sense of self, not self-flagellation that you're not baking. If the kids are playing independently, pop an audiobook on while you're doing housework. Keep that connection with who you are, and the things that mattered to you before you were a parent - even if it's just a few minutes a day. It makes a huge difference.
Hang in there!