Nick, she sees something in you.
You may not see what it is at times, but you sort of have to assume she likes you for a reason. I'm going to take a wild guess and say she isn't with you for the fame or the money. Apparently she really likes the Nickness of Nick. This is a good thing. I often can't see any reason why my girlfriend would stay with me - she can do better. Believe me, many men feel that way a lot. I'm sure women do, too, but my experience and knowledge on that side is more limited.
Anyway, just like no-one can suddenly "solve" your problems for you, or give you "the" solution, neither can anyone solve hers. When you're stressed and burnt out and depressed, you drive yourself ever deeper in a negative reinforcement spiral. She may very well do the exact same thing. She doesn't need, and probably doesn't want, someone to tell her how to "fix" things - there are no easy solutions. You don't want or need her to "solve" your problems, either. Just being there to offer support, to commiserate, to vent to, for all I care to pick up her child and play with him for a bit because she doesn't have the energy to be positive and active around him. Stuffing food into her mouth when she doesn't want to eat (or, vice versa, stop her from drowning herself in alcohol or drugs, if that's her way of dealing, though I don't think it is based on earlier posts), anything. Be there, and try to do your best. It's all anyone can do.
I've often said my girlfriend sees an idealized version of me, that she's not really in love with me but with a construct in her head that she thinks I am, which is better, braver, smarter, etc than I actually am. When I'm feeling slightly better, I realize that this is nonsense: no-one, not even we ourselves, can see our "true self". We
are a construct in everyone's mind, including our own.
She believes in you. As far as I can tell, her kid believes in you. Both of them love you. That some others
don't believe in you is also true. You can be negative and focus on those who want to break you down, or try to be positive and try to live up to what the people who do love you, think of you.
Look, I don't have any answers, either - I'm sort of in a depressed rut at the moment too. But I've been told a hundred times I can write well, that it's pleasant to read, etc. You know how many books I've started? Zero, because I don't think I'm creative enough to have a good, original idea. I'm still stuck in the same dead-end job I've been in since college - under my level, working nights and weekends, having far too little social life, not doing any sports or getting any physical activity. I'm jealous that you've managed to write a good, funny book - and a second one that I'm going to assume is good too. I'm jealous that you've managed to get in better shape and been capable of sticking with yoga for so long, having a serious impact. I'm jealous that you somehow manage to at least go out and
try to find another job, try something new. You're not Superman. You're not going to be rich or famous this time next year (probably). But, having met a few semi-celebrities in my life - hardly anybody is living the "perfect life". Just look at Markus Persson's tweets about how depressed he is - he's famous, but not in the "constantly bothered in the streets" way. He's changed the world. He's rich, and respected. And he's still depressed because his life isn't what he wanted or expected it to be. No-one's is. As far as I can tell, you're caring, loving, intelligent, creative, attentive, playful. Yes, you're probably also a grump, and childish, and over sensitive. So what? Everyone's got good and bad sides, and suffering and striving is the Human Condition. You keep on fighting for a slightly better place, for a slightly easier time, for a slightly more fun life. One important thing is having someone who loves you and who you love, someone you can rely on and who can rely on you. I don't have a crystal ball - I don't know whether or not you and Alyx are meant to be, and if you'll be together in ten years' time. But don't push her away because
you think you're not good enough for her - she can be the judge of that. Try your best, and it's all you can do.
You're not a failure, or a joke. You're a person, struggling with life. So am I. So are most of us, here. Heck, we sometimes joke about
@Docseverin being the perfect man, being brave, bold, good-looking, honorable, smart, whatever. I'm sure he's not always happy and often insecure, that he questions his own worth, that he doubts, too. We all do. if you don't doubt yourself, if you're never insecure, if you never think about yourself or question yourself, well, you might just be Donald Trump
Anyway, take care, and don't hurt yourself because you think you deserve it at the moment. Cutting out people who are there for you is just as much self-destructive as cutting yourself literally. And have a hug.