You need to get out and about and some social connection even if they aren't friends and also to have a break
Spend this morning searching for free activities in the area, the library is a great place to start. If you aren't at work make sure you go to them. You'll eventually see it's the same faces and spark up conversation.
If you can enrol you children in a class then go prepared with a coffee and a book, knitting/crochet and a downloaded TV show - whatever you are into and sit and do it in the car as enforced 'you' time away from chores
When at home have the radio or podcasts in in the background, it makes you feel less alone with adult voices in the background.
Do things that you enjoy, forme that's going to the cinema/theatre, there are often cheaper showings and ofcourse its child orientated to begin with but as the grows you can go to things that are more to your taste too.
Then plan what you want your life to look like in 10 years. Right now you are in the thick of it, but you can take small steps towards the future will make you feel like you have more purpose