You are getting reacquainted with “sober you”, and depending how long you were drinking or using, it might have been some time since you last met.
Sober You might be a natural introvert. Sober Me is. It’s not that I don’t like people…I love people. It’s more a case of energy flow and energy generation. I love people, but they wear me out. Energy flows from me to them. I need alone time to recharge.
You are at a place right now, where your battery is quite low. You are recharging in a healthy manner. Being around people, especially those who drink and smoke, pulls energy from you. Not only social energy, but more so because you will have to resist the temptation to join the party, drinking or using.
Keep working on “sober you”. Make that person your BFF. Feed that relationship first. Then, when you are strong, begin reconnecting with people, but always on your terms.