Not to be harsh or anything but this post doesn't stem from a root of.. " Am I not good enough?"
It stems from entitlement. So the expectation here is.. " I put effort into X so Y should appreciate it and subscribe to my Paetron."
This same mentality is what made the streaming community so freaking toxic. Everyone thought they were special.
Here's some helpful recommendations:
If you're looking at your comic as a way to make money then it's a business for you. Treat it like one:
What are you offering?- What are you offering (Service or material wise) that would make people want to subscribte to your Paetreon. Make sure it's reasonable. )
Advertise- Are you doing your best to advertise your comic on different platforms, even paying for ads?
Analytics- Are you tracking your audience, and seeing what groups your work appeals to?
Branding- Have you established something easily recognizable with your work that people can associate with you?
Networking- Have you reached out to others? Sometimes friends will advertise your work for you. (BUT: Do not expect a "quid pro quo" with this one. No one is obligated to share your work.)
Community- Have you built a community around yourself and your work? (i.e. Discord, website, etc.)
If you're looking at your comic as something you do for self gratification, fun or just wanting to share your work, then this shouldn't be bothering you at all, and you shouldn't expect, or feel bad about people not subscribing to your Paetreon.