Is it bad to be really shy?

Nope. So many people try to tell shy people they need to "get out of their shells" and whatnot, but that's ridiculous. Shyness is an innate trait. It is part of a person's personality, who they are. It is nothing to be ashamed of or "fixed"; it's totally fine! Be who you are! Embrace it! Just don't let it hold you back