Sexuality crisis

So I know I really like girls,like a lot and I originally came out as bi but then I lost interest in guys and really like girls..but idk if I completely lost interest in guys, I act 100% lesbian because I don’t want people to think I’m indecisive about who I like. What should I do to find out if I’m into guys and if I am how do I tell my friends and family then I’m not lesbian