if chest fats make your chest saggy,boop-like, it is called jinecomasty or ginecomasty. and there is a special surgery for it. but if it is just some fat,you can make pushups.if it doesnt work, get a liposuction.
I was having the same issue but in a smaller degree, what my trainer said is to do more cardio, more lower chest excersices. Meaning focus on the lower part of your chest, use the bar under your nippels, and if you are going to do equipment do it on a lever that it would be under your chest.