I have trouble talking to guys...

I would normally label myself as an outgoing person, but that it true only when I'm with girls. When I'm surrounded by boys I freeze up, and they don't even need to be attractive. I have this one straight guy friend that I talk to, and when he tries to talk to me in person, I freeze up and I can't even start a conversation. But, when we start texting I can talk for hours. I really don't want to keep doing this, because I want to be able to just talk to him, but I can't and it makes me so mad. What can I do to become less socially awkward around guys?