I feel antisocial and defensive? :(?

So for a background.. I just moved into an apartment where I have a housemate and my own room finally. I had a dispute with my ex-roomates and left on bad terms... In the meantime I'm on summer break from my uni and I feel all alone now because all my friends left to go back to their hometowns...I don't even feel like leaving my house anymore because I always seem to encounter either rude or plain creepy people... I wanted to go back to my hometown to visit my friends some more (I just got back about 2 weeks ago because I have to find a job) but my parents said I need to stay here to find a job plus summer school starts on monday...I've been jobhunting a lot lately and so far no luck with anything..I've had 2 temp jobs that were very difficult and didn't last in them.. I still feel really insecure and alone and I wish it could stop... Any advice? I don't really know what to do, I'm 19.