I keep making other peoples issues about me.?

Why is it your job to be everyone's cheerleader? Your fat friend obviously is using your compassion against you. Stop allowing her and everyone else to manipulate you and your feelings. She ate her way up to being fat, it's her responsibility to lose the weight, not yours. When she loses 25 pounds THEN compliment her. But YOU ARE NOT THE WORLD'S NURSEMAID! It's as simple as that.