I am sad and depressed, but I like it
How would you like something like being sad and depressed?
Sadness is like stepping into an art exhibition, and hearing music playing.  You feel like you are remembering something beautiful.
It's okay to feel sad because good times in the past are over, because you will always have your memories of them.  However, if sadness is taking over your life, then you should get help, perhaps from your family.
I enjoy my life without my friends and family. That isn't what makes me sad or depressed.
Just know that you will want to meet some people in your life eventually and if you continue in your life alone you will be more prone to become sad.