Greetings everyone!

I've been playing fallout 4 for 17 hours in total and the moment that I meet institute's father at the CIT ruins I accidentally killed him, and I think it messed some things with my quicksaves. When I try to load the quicksave where I'm at the CIT ruins, it says that the quest "talk to father" is complete, but when I teleport to the Institute for the next quest, everyone there is hostile. And there are no other quicksaves to go back! The last one before CIT ruins goes way back to diamond city at 4 hours of gameplay! Is there anything I can do here??