"I don't think it's harsh," Milo replied, rubbing his eyes underneath his glasses, "It's just that, being told, 'dont worry, it doesn't matter what people think, just be yourself,' but it's not realistic, it's not like I've not been told that a thousand times, and it--it's not that I don't appreciate the effort--but it's not actually helpful, because it just makes me overthink about how I'm overthinking." He exhaled sharply, not knowing how else to explain that he already knows Peter, Xander, and Alec form a pretty good band, and he hasn't really played with other people, but because they play with other pretty good musicians, they may be expecting more from him than he can provide, but even though they keep saying it doesn't matter, because they just want to have fun, if he sucks, then they won't have fun, and it doesn't matter how much they say they won't be bothered, if he sucks, they wouldn't have the same fun they'd have if he was good, because they'd all either need to babysit him or pretend like he was better than he was to try to preserve his feelings, and that would suck for everyone.
He didn't doubt that they'd be nice about it, he didn't expect them to turn around and be mean, but it'd still be lame and embarrassing for him and either they were being dishonest to him or dishonest to themselves to pretend it really, truly did not matter even a little bit how he did, telling him to not care and just have fun made him feel like his brain was going to melt, because how was he supposed to not care if he was playing well when playing with other musicians? It was possible to accept someone for who they are while also being disappointed!