Pay attention to how others talk to others and react to others in conversations, take note in what you think are positive traits or traits you yourself like, and try to take after them in those very traits. But do so in a way without sacrificing in not being yourself and your own personality. Find a balance between who you truly are along with the traits you like to take after from others. This will probably shape your ideal personality and identity in many ways. Practice, exposure therapy, by talking to people as much as you can as social exercise. There will be lots of trial and error as you do this. Years and years of it, maybe life long. But overtime you will gradually improve before you know it.
Enjoy any good things, even the little and menial ones, as you will never know what impending distresses could descend upon you in a moment.