I feel as if I've burned down a lot of bridges in my life.

So I'm 23 years old, starting to learn what its like to be an adult. and most of my life I've been an introvert, so I didn't make a lot of friends, but I had a few very close friends.

Recently, I found most of my old friends of facebook and immediately messaged all of them, but none of them replied.

Have any of you felt like this before?