Sometimes I wonder if I'm the reason my friendships don't last

I'm a 26M from Gorakhpur. Over the years I've had many friends and a few relationships, but now around 99% of them are completely out of my life. Some friendships ended because of fights, while others just faded away for different reasons.

Sometimes I blame myself and wonder if I'm the problem and that's why my friendships don't last. I also often think that if those people were still in my life, maybe I'd have more people to hang out with, more plans, and a bigger social circle.

Does anyone else feel this way, or is this just a normal part of getting older? For context, I still have one close friend who's been with me for a long time.