Since reading some other comments, I don't know what is meaningless anymore, I now think that you could find meaning in everything if you looked.
I think rephrasing the original would do better, it should probably be about living a fulfilling life without harming others and not ignoring good opportunities because you think you should wait until the perfect time that'll never come.
However this ignores unavoidable pain that we all get in some way or another, in your case mental health, so I'm still not sure what would be a good way to live, as we aren't always in a decent enough position to take up the kind of opportunities I said earlier.
Thank you for this, I think it's now more about trying to become fulfilled in whatever position you are in life and trying to make the best out of our lives.
Although, as you said, there isn't a right way to live, but I personally think that we should strive for improving what we can, with the little power over the world we are given and to avoid hurting and making other people's lives worse.
The thing is, I don't think spending time with loved ones (your dog for example) is meaningless, infact I think it's very meaningful.