Well, for me, being myself constitutes saying what is on my mind - which of course, doesn't always add up to nice-nice. Sometimes I feel that I don't agree with what someone is saying and I want to say so. But of course, my SA often severely limits my ability to do so, so I often just nod or say nothing. The biggest issue I have with this disorder is being able to speak my mind, and most of all, confrontations. Attending a boarding school and living with a house full of girls all about the same age as me was..... just short of hell. There were many times I needed to speak up and of course didn't, and then suffered inwardly because of it. The few times I DID, well, I payed in other ways, with more torment from the girl I spoke up to. It always resulted in anxiety, guilt, depression, etc. So, yeah, being myself would be speaking my mind and being assertive. Which feels impossible with SA. Therefore, I can't be myself until I beat it.
It's not "just be yourself and you'll beat it," no - it's beat it and you'll be yourself.