Why is it so difficult to change our life or habits?

For example - I know what everyone of man have to be strong. Woman should feel herself protected by a man. But if a man don't feel his strong, and he isn't a confident, he can't make a good relationship with woman.

How to become a self-confident?

I'm thinking about GYM, but I can't dare to first step and go to it. In my mind I don't want to go it, but I know what it is the good way to be stronger.

I'm thinking abour roller-blading, but In my mind Women's kind of leisure and etc.

 

How to avoid that excuses and change a life?

Crazy questions :D I'm sorry!