Hey man, stopping is the worst thing you can do, as not working will not help you improve.
I know so very well that a lot of times it will feel like what you're making is absolute trash - god knows I've felt it. The real challenge is persevering and continuing to work hard. I'm not sure, maybe everyone has heard it, but I advise you to listen to the quote by Ira Glass. It's cliche, and it's stupid, but it's so very true.
I started drawing, because my head was bursting with ideas and visuals, and I knew for a fact I wanted to share them. I was also too lazy to learn how to write :P. But I hated what I did, day in and day out, for years to come, and still do sometimes.
If you truly feel that this is what you'll have to do, like how I felt the need to share my stories, then for the love of god - giving up is not an option!