How do you get the courage and express to do the things in your mind? Every time I start I keep thinking "this is not good enough" and stop.
it seems like the fact that you are asking this question means you want to express yourself. so the courage will be there, if that's what you want. the rest is just spending time with it. and remember the golden rule, which is that at every level of experience, even the highest levels, there is a certain element of 'here is a pile of crap, you will like this crap.' what the heck, i do that every day, what with telling people my favorite cereal is marbles. or maybe some people may view that answer as just the perfect answer. at every level of art there is a certain degree of 'World Renowned Artist Presents: Crap.' Look at even the most well respected pieces of art. You can see how they're crap if you put yourself in the artist's shoes. (is anyone going to think this is good, or is it just crap). So go ahead and adopt that mindset early, and that should allow you to have a nice rebellious good time, in the meantime, while you are gradually and unassumingly accumulating genuine experience, which will inevitably happen over time