The most popular ‘Yes, but..’ is that it is scary. Well yes, you’re exposing yourself, you’re the center of attention for a while, people will notice you. But the point is that you are noticed for being you. Confidence is something you build as nobody starts out being instantly confident. And everyone there is feeling the exact same thing, but might just be better at hiding it.
‘Yes, but..’ what if I fail?! Trying and failing is always better than regretting. Especially in a setting where failing means very little in the grand scheme of things. There are no lives depending on your performance or any sense of being less than anyone else. You just have a chance to present what makes you ‘You’ and you might get to do it again on a bigger stage. Its bound to be more fun (and lead to more fun) than it is stressful I promise!