Why is it so hard to be friends with other guys?

I've only had a few guy friends in my life and the rest have been girls. I don't know why but it's always like this. Now I wanted to make more guy friends because, well, I'm a guy too, but it seems so difficult. Like I tried to make friends in my classes but only became friends with some girls again. When I try talking to other guys or working with them, they usually don't say that much and go back to their friends eventually. Its so weird too because in some of my class, there's guys always talking to each other, even if they aren't friends, but no one ever starts talking to me.

I don't know how to even approach it anymore because girls have been more open while talking and working, which eventually leads to becoming friends, but guys don't do this usually...

What am I doing wrong, or what should I be doing?

Why is it so hard to be friends with other guys?
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