I want to be less bitchy? How to become "nice"?

Chelseaisnotyourbro
I'm on the bitchy side, i make exceptions for people I like... i'll be nice to them. How can I be nice to everyone? Some people just annoy me and I snap at them but I guess I have to just control myself better? I become impatient and I see that nice people don't lose their cool and they keep talking to annoying people. Hm, maybe i shouldn't be nice. Wait, that sounded bitchy. See, i don't know how to be nice. It's not like i go out of my way to make people feel bad nor does it make feel cool or anything. I just say what i need to say, i'm a very straight-forward person and i guess it comes off as bitchy. Now i'm rambling. Sorry.
I want to be less bitchy? How to become "nice"?
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