Not sure if i'm actually bi or just curious about men

I have been thinking a lot about being with men. Strange thing is, that I haven't met men that I find attractive. But I am very curious on a sexual level, think about their tools a lot and I know that I'm not a top type. The fact that I am a very nervous and anxious person doesn't help the fact that I never have the nerve to actually try it. So i'm not certain how things will go with it. Hopefully I'll be able to one day overcome my fear, but time will tell I guess.