I am certainly in the boat of never being able to say no- it's caused lots of grief by overbooking, and overextending myself and my hubby- He insists I need to learn to say no, and not get disappointed when others say no to me....
And I have discovered that it is NOT "what comes around goes around", it's rare that I ever ask for anything, and that's mostly because I do more for others than I've ever had done for me. Reckon I do need to learn to say no more often
