When would I know, that I’ve reached this goal?

Well it’s not that easy, I have an image of an person in my head, that I want to be. Sometimes I even feel bad when I’m doing things like I want to do them and don’t do them like this fictional person in my head. I guess, that’s what make things hard. Is it possible to be happy this way? -I don’t think so.
But how to change it? I don’t have many friends but one of my closest seems to want me to be someone else… Sometimes, it makes me feel so angry!! She makes it so hard for me to change and I really need to, because now, I don’t live life like I should – like myself.

I wonder if it would be good to tell her about it or to refrain from this friendship…