It's also normal, and okay, to feel down about being tired and feeling like you can't do everything at once. Because that's how it is — you can't do everything at once. You have to choose, and a lot of the time the depression comes from the conflict of having to give up things you want to do.
And what can also help is talking to your partner or to a friend who's also a parent. And realizing it's normal to look forward to the weekend being over so you can sit down and work on the thing you're good at and know how to do... unlike dealing with our kids, who are always creating problems we don't know how to solve.
Luckily I have an amazing wife. We don't hide anything from each other, and she's always been there for me (just as I have for her). I have good support.
That said, you say "it's normal to look forward to the weekend being over so you can sit down and work on the thing you're good at and know how to do" - this isn't what I'm getting at. I look forward to the weekend being over so that I can spend time away from my kids. I trudge through work for the week while trying to regain mental energy to tackle the after-school pickups and the next weekend. I'm just always running at a mental energy deficit. I enjoy my work, but I just have no energy to apply myself - the kids suck it out of me.
And what can also help is talking to your partner or to a friend who's also a parent. And realizing it's normal to look forward to the weekend being over so you can sit down and work on the thing you're good at and know how to do... unlike dealing with our kids, who are always creating problems we don't know how to solve.