Bi-Curious

I'm not sure if I'm bi or not🙄 I have 1 daughter and am currently in a relationship. I have been curious for awhile now I find girls attractive but I have never actually hooked up with a girl to confirm if I am bi. I have talked to my boyfriend about having a threesome with another girl but I can't find myself to actually doing it. I don't know how to actually know if I am bi or not😏 #Help