General Admission + Small Venue + Chiodos + Fans= ?

I'm thinking about going to a concert. It has Linkin Park, Coheed and Cambria, and Chiodos. It's general admission so my dad is freaking out and saying I'll get smushed and groped in the crowds. I'm guessing it's a small venue because my dad's never heard of it. What do you think will happen? I'm guessing there's gonna be a lot of guys there and I happen to be really short and small. :( I desperately want to go. Can you guys give me some advice? If I go my dad has to come and he grumbled about how he doesn't want to fight anyone...