I have been trying to make my life more peaceful by means of using excuses when the straightforward approach would not cause a solution and only pisses people off.

Please teach me how to make valid excuses without people catching on. I have been able to slightly lately but they generally look at me and size me up to see if I am lying to them. One guy said, "are you serious or do you just not want to help me?" I honestly really didn't want to help him as I had my own project so I told him, "I'm really not sure how that works. Sorry buddy."

I'm putting this in /r/seduction because I feel this is the best place to develop social skills even if it isn't a seduction technique.