Please help, I need advice about my dad?

Okay, so your dad is being overprotective. First, sit down for a talk and tell him that he's being too overprotective. Second, tell him that if he thinks you're doing something bad online, tell him that he can regularly monitor your online history. Then tell him that it's a normal part of life to have guy friends. You could say, "Didn't you have lady friends when you were my age?" or something like that. If he wants to spend more time with you, than do it.