How do I act like a 19-20 year old girl?

People keep telling me that I act like a 14 year old emotionally and socially even though I am chronologically 19. I was home schooled through grades 6-8 and I was clueless to social cues throughout high school and I am getting over anxiety and depression on top of that, which makes it hard to learn how to mature. I am still a tomboy because I am a feminist and I do not know how to act feminine. The only way I am mature is that I am responsible (I get pretty good grades) and I am always polite and courteous. Any ideas how I can act like my chronological age?