Of all the places and people to give out your adress to I think this is the best one. No place on the net is actually "safe" but I don't think your parents should get too upset, seeing as most people have personally met and know eachother personally, trust eachother and have swapped gifts numerous times.

I hope you can get her to let you stay. It wouldn't be the same without you. Oh and not to be mean, but if your dad said not to give your adress out than you shouldn't. Because you should know then that when he finds out, he'll be pissed.