Am I bisexual?

I've only been with men before. I've dated a lot of guys. I get bored and my longest relationship was 6 months. I even get bored of the sex. The last guy I dated i couldn't help but regretting not trying to date a female first before asking him out. I've had small crushes on my female friends before even when I was little. I thought I couldn't be into females because they were never intense crushes. I had a very intense sexual dream about one of my female friends in the past. I also can't help but picturing me kissing my other female friends when im around them? It has been on my mind (on and off for years and years now). I have only gotten slightly jealous of my female best friends fiance a few times before. Is this normal for straight people at all? My dad would be so against it. I'm 24 and don't live with him but that's not the point. What do I do? I've been trying for years now to ignore it. I don't want to deal with the stigma...