A few years ago I was also like this. I wrote fiction but never tried pursuing it as a "real" hobby because I wasn't perfect at it first try. Why bother at all, right? ;)

"Good" Fiction writing is an inaccurate science but has a similar trajectory to what the author went through. To become good at it you _need_ to read other people's works (the good AND the bad stuff) to figure out for yourself what makes that writing stick out to you, and you need to learn to love to edit, and to show people what you did.

The most time consuming portion of the writing process is the editing process in my opinion. It's also my most favourite part. You take a half-formed idea and you cut. And you tweak. And then you cut some more, until paragraphs start to take the shape of the story you actually wanted to tell, and sentences become so load bearing you can't remove any of them without altering everything around it. It's a puzzle with no real "solution" other than what I feel works.

Really, it's only after I kept at this for a while (and put things out there and didn't get bad comments at all!) that I started to get a little more confident in myself and begin to go to writing groups and such. It's hard work but it's worth it, just like any skill.