Why dont i feel girly?

I’m 17 and I have an amazing boyfriend of 3 months. I’m not homosexual, but for some reason I don’t really feel like a girl. I’ve been having this issue for a month or so but its stronger this past week. Maybe my hormones are all up in arms bevause its around that time, but its awkward and I don’t know where to turn. I’ve never really thought I was pretty, granted I’ve been told. What can I do to feel more like a girl?