There is a version of the creative life I have been watching people live for twelve years: the version where you spend more energy justifying the work than doing it.
You know this version. You may be living it. The apologies at dinner parties when someone asks what you do. The careful framing — "it's still in progress," "it's just something I do on the side," "I'm also looking into other options." The elaborate explanations of why the painting/novel/practice makes sense, is actually viable, and is connected to real skills that real employers would value. The constant low-grade work of making your life legible to people whose approval you're not sure you need.
I spent years doing this. It is exhausting in a specific way — not the exhaustion of making things, which is the good kind, but the exhaustion of defending a case you already won. You already know why you make things. You don't actually need to convince anyone.
The problem is that the explanation feels like action. It feels like progress. You are engaging with the question, you are being thoughtful, and you are demonstrating that you have considered the objections.
And in the meantime, the painting is not getting made.
I am a Polish immigrant who became an artist. My father is in Poland; I am in New Hampshire making art and writing. No version of this biography requires occasional justification to people who expected a different kind of success. I am familiar with the feeling of watching someone's face rearrange itself when I say what I do — the microcomputation, the attempt to file me into a known category. I used to help them file me. I provided the context, the credentials, the list of platforms, publications, clients that demonstrated that what I did was real.

I don't do this anymore.
Not because I stopped caring what people think, but because I realized that the explanation was costing me something: not dignity, though that too, but time. The time spent constructing the defense was time not spent doing the thing I was defending. And the more I defended it, the more I behaved as if it needed defending.
Here is what I know now: the work defends itself when it exists.
When the painting is on the wall, nobody asks whether the painting was a reasonable career choice. When the essay is published, nobody asks if it was practical to write it. The finished work is the argument, and it is a better argument than any explanation you could give over dinner.
So the question is not how to justify the life you're living. The question is how to live it enough that justification becomes irrelevant.
You make it irrelevant. Or, rather: You—make it irrelevant.
Stop explaining the project that isn't finished yet. Make it finished. Stop defending the practice to people who don't share it. Practice it. Stop justifying the hours you spend in the studio to yourself, to your family, to the voice in your head that sounds alarmingly like every practical person you have ever known.
That voice is not wrong to ask the questions, but it is asking them at the wrong stage of the process. The time for questioning whether to make things is before you've been making things for five years. Or even two. After years, the answer is clearly yes. The question now is just: WHAT.
You have already won the argument about whether to live this way. You've been living it. You just keep relitigating it instead of moving forward.