Throughout my life I feel like I've tried sooo many times to start doing X or stop doing Y that any thought of trying again feels meaningless. I "know" I'm just going to fail at walking every morning or eating less or picking up a skill or going to the gym or etc etc, so I don't even bother starting. And being a grown man, I don't really have anything that can motivate or force me to stick to something like that. I'm happily married but my wife has the same problem and we're both awful at holding each other to new habits.
Anyone else felt this before and come through the other side bettering themselves?