I dont know. When I was younger, if I heard a noise outside (at night) I would hide under my covers and wait for my parents to go check it out. But ever since I weas like 13, if I hear a noise, I go and see what it is, so, if it ever was someone actually trying to break in, I'd probably be fucked, considering I'd already be down by the door or window where they're trying to break in.
I'd probably just fight. I'm not gonna say I'd win, or kill them or anything, and act liek some huge tough guy. But what the hell else am I gonna do? Sit there while they either kill me, or take aeverything in the house? No. I'd probably call the cops, and in the meantime, try to chase them off with a knife or something, or just swing for the fences.