I’m just lost

So I’m a 21 (f) and I’ve been thinking about a lot of things in my life and Ive been thinking about my sexuality a lot and Idk don’t why I’m confused but I am. For years I’ve always said I’m bi. You know I know I like guys and girls but I’ve never been with a girl or done anything romantic wise but lately the idea of being with a guy now is not a good feeling like thinking of being with a girl (not anyone in particular just another girl) makes me more flustered than being with a guy. Anything romantic/Mature/ or just anything! Sounds way better with girls then a guy and I know I like guys but Women just sound way better and I don’t know how to feel about anything. And this is more complicated and confusing because I’m in a relationship (3 years and a few months) with a Guy and I know I love and care for him and sex life is kinda good (tmi sorry) but like just the feeling of being with a girl just feels and sounds better and I just don’t know why. Am i just like overthinking about this thing or like crazy? I can’t tell you what answer im looking for im just lost and I need to get things off my chest