But here's the secret: If you behave like this, then people will only interact with you when they want something from you, leading to an even more bitterness and unfriendly demeanor, leading to even worse interactions with other people.
Instead fake being nice and friendly and people will be nice and friendly with you and after what might feel like forever you will become genuinely nice and friendly. Giving you the possibility to enjoy better people and the better side of people.