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

I’m pretty much at the stage now where I do this without thinking.

I did this on the weekend. Felt guilty for about half an hour, then decided that I had a much better time by saying no and doing what made me happy! I have far too little spare time to waste it at the moment doing things that I feel obligated to do.

I feel like if I say “no” then I will be letting people down and make them unhappy with me.

I made a first step on the weekend though and said no to something that I felt obligated to do. I still felt a bit guilty, but at least I did stand up for myself.