I keep fucking myself over and eating shit foods and overeating and its stopping me from loosing weight and keeping me as a fat loser.

Can someone give me some raw advice on how to keep the motivation and willpower to make this lifestyle change.

Idc if its mean or nice. I just keep telling myself im gonna do it and then i fall off the horse, feel guilty, sad and stupid. I wanna have a 6 pack one day.

Any advice in fitness consistency?