Why do straight guys fear being gay so much?

I honestly have no idea how to go about correcting this. We can try as best as we can to educate people, but ultimately it is up to them to choose their own actions. Personally, I can just shut off my emotions whenever it gets too overwhelming. I can calm down instantly and logically think my way through any situation I have come across. I believe that emotions are necessary to understand how people feel, but acting on them is not usually the wisest choice.