Your question was "Is this a bad sign?" And the answer to that is NO. You're doing just fine. But if you're looking for a funding from YC (which is an external validation btw), they would rather fund someone who are willing to quit their job and commit 100%.

Like I said there's nothing wrong with your approach. If you believe you're doing the right thing and you can see the growth then you are doing it right.

You WILL know when it's time to quit your job and commit when the time comes.