What you want is important too.

Radical Acceptance: It will be ok when I say no. Other people may be disappointed with it, and that is a normal experience for everyone. I can't change how other people feel, but I can decide if I let it define who I am.

edit - I say 'No' a lot, and I used to pretend instead that I didn't want, need or care for anyone who had a problem with my 'No'. Its easy to say no like that... saying no to the people you do want and need is the hard part. It's still hard.