@papermoon First of all, welcome! As you can see, everyone here is seriously amazing. Don't ever feel weird about sharing anything you're going through here - you'll find nothing but support from your fellow artists, mainly because chances are, we've been through it or are going through it too.
A good example of that is what you've mentioned in this post - I can completely relate. I found that Ira Glass quote that @smceccarelli shared a couple of years ago and it helped to keep me from quitting art altogether. I'll share with you my story, which is a little different than a lot of artists in general, but not so different from many of the artists here.
When I was in 6th grade, I "discovered" drawing - and found that I really enjoyed it. I'd spend hours drawing little animal characters at school. But in 7th grade, I met a girl named Lianne who was really amazing for her age and it made me feel so discouraged that I gave up. I thought that if I wasn't naturally that good, then I'd never be, so I just put away my pencil and only picked it up every few years for a single sketch or drawing on a piece of printer paper or a napkin when I could no longer fight or ignore the urge to draw. That mistaken belief stuck with me my entire life and, although every few years I'd get the fire to draw something, it'd quickly pass after I drew something that looked, understandably awful. I have no idea why I didn't realize that it takes practice to get better, but no one ever told me that, so the mistaken belief that drawing ability is innate stuck. It didn't help that I had 2 super talented artist boyfriends through the years who laughed when I'd draw something and would just say, "draw what you see" and dismiss me when I'd try.
Finally, when I was 39 I met my husband and, when he first saw one of my chicken scratch drawings, he was nothing but encouraging. Because of that, in February of 2011 I started drawing and never stopped - it's been an obsession ever since. I'm now 45. But I can't overcome the frustration over the amateurish look of my work compared to others. I know I want my work to be in conventions like IlluxCon, next to my favorite artists and I beat myself up for all of the time wasted. I think my work is embarrassing. But when I find myself feeling that way, I turn on an SVS video or some other art learning tool and I get to work. I remind myself that I was able to get where I am because I put in hours of practice, so if I want to get further, I have to do the same. It's especially hard though because I have to struggle with the feeling that I'm playing catch up with people who have been practicing for 20 years.
But I've found that when I get the most frustrated, it usually means that I'm about to level up my skills, so I now start to look forward to that feeling in a strange way. So take heart - we've all got a story and we've all got regrets. It's natural. Just don't let those get in the way of kicking butt and taking names :).
Btw, I saw a meme a couple of years ago that runs through my head a lot: "Practice until your idols become your competition."