Happiness in no way in Nature's plans; Actually Nature's plans don't exist, or the only one (that seems like a plan) is life propagation in every possible form; The more we know about obstacles to happiness the better it is, as the road to it might be quite 'unnatural'. Lack of cooperation, stupidity and pure wicked actions are obstacles to happiness, I think in this order; also we usually forget that happiness (or lack of devastating social problems) is better achieved by humanity as a whole, not by the individual. The individual should obviously benefit of a certain degree of freedom in order to make and try to fulfill his own plans for his life.

Obstacles in obtaining happiness could be: poor health, poor education so that you are not equipped to have the job or career you would like to have, no friends, problems with your family, and no knowledge of the meaning of life. If you have a secure job that will support yourself and your family (if you have one), shelter from the outside (a house), someone to love you, nutrition and the above mentioned items, and you have not gotten yourself in a lot of trouble, you have a good chance at having peace a happy life.

Life without obstacles is a clock without time, one cannot survive without the other. Just have a patience and trust then all the obstacles will be minimize and unblock from the way. :)))

You trust Jesus Christ as your Saviour. ...If you have more questions regarding my answer, I would be happy to answer them:)

I think there isn't any obstacle in achieving happiness, the only obstacle is yourself. A poor man can be the happiest man on earth and the richest can be a poor without happiness. Be contented with what you have, try enjoying things at present and this can be achieved by putting metal doors on your past and future and living in present:)) And Nature has a plan, you just have to connect the missing dots;)))