I am looking forward to make new friends in Pune or PCMC!!

It’s hard to make new friends once we graduate from college!! I have lost many friends since my graduation. I have been living in Pune since past 10 years now and I have tried making new friends after graduation but I found out that every one of them are already having their “own” friends to hang out!!! Why is it hard to make friends in cities?? I hope I am not the only one who has this problem. I am inviting everyone to message me personally if you want to make new connections or friends.