Make exercise a reward, rather than a punishment. Think about how you feel at the end of a run and use that to motivate yourself.
Getting fit is all about changing the way you think. You shouldn't exercise because anyone tells you to, but because you want to do it for yourself.
Fear is the biggest thing stopping people from doing what they want. It's natural. But you are never too old to change.
By taking shallow breaths, you get less oxygen to your brain making you feel tired. Take five minutes to breathe as deeply as you can instead.