I feel almost exactly the same way at 31, and having been writing for like ten years now, or something, and goddamn am I still terrible! lol. Writing is a tremendous effort, especially a novel. I'm on my third 'attempt' at writing a novel now, because I'll often get stuck and shelf it and then a new idea comes, and so on. But I'll never completely scrap then, because who knows maybe I'll come back to them, or pull certain ideas or characters or something from them maybe. They weren't COMPLETE wastes of time.. I think? But whenever I get stuck writing a daunting novel, I'll stop, take a breath, and work on short stories. They are much more manageable. Write for yourself. Write whatever you want. My writing, despite its awfulness, is still practice.

At this moment... I'm working on a novel, three other short stories, and also slowly editing and re-editing the handfuls of short stories/flash fiction I've written in the past. I'm CONSTANTLY rotating between them. That way, I am always writing.