I'm more comfortable talking to girls than guys?

When talking to girls, I’m more comfortable and my voice gets deeper with masculinity. But when I talk to guys, I feel more inferior and my voice gets higher. But this is only when I make new friends, the majority of my friends are guys and I have no trouble talking to them.
I guess I don’t feel a need to impress guys, and I feel more of a need to impress girls. But I want to make friends with more guys in my classes. Any suggestions?