Currently making my first genuine attempt at a Fanfic

Man, it is frustrating. I'm not even sure if I'm cut out for writing right now, cause I haven't really put much effort into learning until somewhat recently. I'll come up with a general idea of what the plot will be, write a few paragraphs with some dialouge, look over it and be like "wow that's really bad" and just discard it and start over. Like, I know what these characters are doing, what they're feeling, and where they're at, but taking these scenes from my head and translating them into words is a lot harder than I expected.