How do you get a less-squeaky and a less annoying voice?

I’ve been told by my sister that I have an annoying and squeaky voice. Ugh. I want to get rid of it. I want it less squeaky and not annoying. Please note, this is not because I want to sing or because I’m very self-concious, just because I don’t want to sound annoying. I still want a few squeaky, but not to where it’s annoying. I’m a girl, if that helps. Oh, and I’m in speech. I’m working with my ‘r’s and ‘s’s. On the brink of getting out of ‘s’.