Everyone wonders about the other side at some point or another, its perfectly natural. My advice would be to not deny the thoughts and just go with the flow with them (let you brain explore whatever it needs to). Sometimes things get way more pent up by trying to tuck them away in a box.
Sexuality is a whole spectrum which doesn't just include "gay, bi & straight". You might be bi-curious, but to be honest unless you're genuinely interested in getting with another guy and experimenting, it doesn't really matter either way.
Re: anxiety around the other sex, being able to talk or not talk to women has no bearing on your sexuality (heterosexuality is not measured by success in talking to/flirting with women).