Well you just need to keep practicing then. Not gonna get better by just watching videos. They may show you techniques, but they also discourage you by making things look easier then they really are. Gotta remember that they probably don't have the things they do planned out. They just do them on the fly.
Also, mediocre videos of those people probably aren't ever going to be posted. Who wants to watch a match where the opponents mistakes made him suicide twice? I know one of my friends plays a pretty decent Fox, but even she accidently Side-Bs off the side occasionally. Hell, I sometimes forget to stop Inhaling when going for a Swallowcide and fall right off the bottom occasionally.
Making mistakes occasionally is perfectly normal. You will have matches you thought you were uber in, and those you though a newb could have beat you in. On Youtube, you almost never see the latter. It glorifies the best, because thats what people want to show.
My Creations in Modnation Racers! Check zhem!
http://community.modnation.com/en-us/players/IvoYaridovich/creations
