I am a shy guy(straight, 18). i have never had any girlfriend. I'm not that socially active. The thing is that, before talking to any person especially girls, i plan my conversation thinking that I will speak without any problems. But when I am in front of them, and try to talk to them I have no idea what happens, I forget what I have to speak, I act like an idiot. i stammer.I dont' want them to make my girlfreind but as a friend .Can anyone say why this happens?