You’re doing neither yourself nor anyone else a favour by being overly shy and reticent. You yourself will enjoy life much more when you are yourself and while not everyone will like you, the ones who don’t often don’t stay in your life long and it’s easier to find people you vibe with if they can see you for who you are.

Granted, I very much did not take this advice as a teenager and even now I’m occasionally too shy. But looking back it was good advice and I really wish I hadn’t wasted so much time and energy on not being negatively noticed by people I didn’t really care about then and who haven’t been in my life for years.