I want to try being with a girl??

I want to try being with a girl but I don’t want to offend anyone. I’ve been with men all my life & don’t know how to go about this. My friend told me to go to a gay bar which seems like a good idea but I’m afraid when I’m there and another girl finds out I’ve never been with another woman they’re gonna think I don’t know what I want or something. What should I do ?