If we are not happy with life, there are two options we can take.
One, make the necessary changes until you achieve that state of mind (peace, happiness, contentment).
Or, Two, leave things as they are and simply accept, with complete faith (in God, Life, The Divine Plan, The Universe, Destiny, etc.), that all is as it is meant to be.
Either way, change begins from within. Either way, a natural state of peace will prevail, and the temporary state of discontentment will soon pass.