Say "no" every time i feel like it and not feel guilty

well lets see, i used to hate saying no to people but i think this change has gone a bit to the extreme.
i’ve found myself saying no too much to the point where i become selfish because i am either too lazy or just too scared to be challenged which is TERRIBLE.

Some advice?
don’t be afraid to say no.
there’s always someone out there willing to fill the position and just as enthusiastic about helping people
BUT
you have to give a little to get a little click click?

“i know you’re really busy and all, but can you help me out by doing this?”

“no.”

YAYAY!

you can just imagine the look of dissappointment on their faces.
it’s too painful.

but at the end of the day
the most important thing is that you are happy.
and happiness is doing what you want isn’t it?
*nods