Strange question, but I want serious opinions?

Kind of a weird topic, but I have been reminiscing about past memories I've had in a country where I really had a fun time. However, back in my home country, I feel so sad since I don't have many friends or close ones at that. I don't get to have any 'fun' times. But I have a question, I have so much nostalgia about this past time in my life and I wish I could go back there, but the relationship I have with my friends there has changed (for the worse.. my sister kinda messed with things) and going back there now wouldn't mean having the same fun. So, this is the part I want you to answer: I know I can't go back there and have the same fun time again because the whole relationship with my friends has changed, but I know when I go off to college (this year) I will start that same kind of relationship I had once with my friends in the other country. So: does that mean I should forget about thinking and wishing I was still back there, having fun with my friends?