Yeah, there's varying manner of confidence / creative indifference issues that we all struggle with. What you describe is more of a personal matter that may be you not necessarily being comfortable with your own self and what you want your work to look like, and wanting the work to be accepted by your audience.
The first thing you need to understand is that no matter what you do, you're not going to please everybody, and that it's okay for other people to not like what you do. You can't control what they like or don't like. All you can do is move on doing what your thing is (and continually strive to improve, of course).
The second thing - and this is a more difficult issue for creators to tackle - is determining whether doing what you do is worth the time and effort for you as a person. Not just monetarily speaking, but emotionally and creatively as well, as the latter can in fact be more important than the former. In your case, you're giving the work away; it's all 'in fun'. So my advice is you should just try to just keep that your priority- have fun with it. As long as it's still fun for you, it really doesn't matter what other people think.
Now, if you're looking towards a monetary / business view of comics... sadly this business can sap the 'fun' of comics right out of you. So be certain that whatever you do, keep it 'fun', somehow. Because once this stuff stops being fun, it's no longer worth anything.
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