Dislike

I really dislike it when people volunteer my help to others without my permission. It is not exactly doing me a favour. I much prefer to offer or volunteer the help myself as I am in the best position to judge if I am able to help. How would they feel if they come to me citing that so-and-so said I can help them when in fact I can't help and have to turn them down? I feel bad turning people down. It is not a nice thing to do to them and to me.