I have. I follow this artist and came across this a bit ago and it gave me pause for thought. Pre-edit: this got lengthy because I'm hoping if you're here to relate to the comic, then maybe my experience can help.
Despite constantly feeling like I'm drowning in incompleteness, I realized lots of things came together. I was too busy focusing on the negativity that I wasn't acknowledging the positives. I have had fun, I have gotten things done, I have fixed things, I have socialized, I have used an appropriate amount of mental/physical recourses, and I have been placed in a solid career position.
I couldn't reach this understanding when I was younger because the necessary pieces hadn't fallen into place yet. I understand that to some extent I'm lucky things came together, but a large part of feeling OK came from lowering my standards. Projects fall by the wayside as priorities change. I noticed a huge number of incomplete projects were no longer necessary - so were they ever?
One of my biggest things was feeling lonely because I didn't have enough friends. By whose standards? Social media's or childhood's or school's? At work, I thought I had friends, but they faded whenever I changed jobs. Somewhere around 2020, I saw the term "friends by proximity", where you can be great friends with someone one day and lose them the next because you're no longer in their proximity. Initially, that hurt, because it made everything feel fake. But the longer I thought about it (months or more), the better I felt. I had fun with these people, I enjoyed their company. We bonded over the current common experiences. Once the experiences diverge, it fades. There is nothing wrong with that. There is nothing fake about that. We don't have enough time on this planet to get it perfect. I dropped all the modifiers I'd say like "friend of a friend", "better than an acquaintance", "former friend", etc. I'll only clarify if it's relevant to the story. Otherwise, it's just past tense like "had a buddy that..." or current tense for someone I'm still in proximity with. Nobody needs to know the disqualifiers. Every friend stems from proximity and very, very few will outlast that.
To sum everything up, ask yourself what standards you're holding yourself to and failing. Are they even real? Are they standards set by a different generation in a different time period with a different societal mindset? Are they set by social media showing only the best sides of other peoples' lives? Are they set by your family? By your friends with entirely different experiences? Should these actually apply to you?