I'm having a difficulty understanding and identifying what is my mission and what is a "man's mission" in general.

I've read in quite a few different sources about importance of having/following a mission as a man.

To live a life to his full potential, man should have his mission a priority. 

On the other hand, a woman, to live a life to her full potential, should have her relationship and children her priority.

How do you identify a "mission"? 

Is mission always (or often) = your professional career?

Or is it something totally independent from, but can overlap with career?

Is mission something big, that lasts a lifetime, or is it something that lasts in particular life period? 

Can you have 2 or more "parallel" missions at the same time?

Does the mission have to be something really impactful to the world around you , leaving it a better place when you die. And is stuff like being the best man you can be and improve every day something too vague to be called a mission?

Is your mission always something that's hard and that scares you? Is your mission something that fulfills you or can it be something that you hate but just know you have to do?

I know pussy should never be a mission, and your marriage is also not equal to your mission. How about your kids? Is this also something that doesn't count as man's mission?

How do know that you are on the right mission? Do you feel it by emotion? Do you know it logically? Do you have to go in the damn forest and spend few days alone meditating until you get an epiphany? 

Any insights or examples should be helpful.