Perhaps you're trying to show him that you are capable of what he is actually doing. Anyhow, you don't need to impress him/them, because whether or not you are capable of doing such things if he's not really interested on you and/or he is, then it doesn't matter.

On the other hand, it's better to be yourself because doing so gives you more confidence without bothering yourself wearing a facade whenever there's a variety of people around aside from your so called 'crush'. To be yourself simply implies that you are confident with your own self and that will be your advantage to anyone else around and/or 'his circle of friends and acquaintances':). However, self-enhancement will boost your confidence more and you really owe it to yourself and not to impress others.