I often look like I have no idea what I'm doing with computers when someone is watching. I also find it almost impossible to practice an instrument with someone

I often look like I have no idea what I'm doing with computers when someone is watching. I also find it almost impossible to practice an instrument with someone watching. Performing is another matter. To do well at interview coding I'd having to drill relevant questions to the point that I was performing rather than practicing in the interview, and I'd probably still be freaked out and unable to do it unless I knew the questions I'd face in advance. Luckily actually working in software development is a hell of a lot more like practicing than performing, and there's usually no-one watching you, so I'm fine at that part.