In a sense, life is an arena for us to "fight" in order to seize happiness in different forms. When we can be a tough person and not easily give up, then the victory will surely be ours.
There is nothing that does not require struggle. True life teaches human beings to be a strong person, because the toughness we have will open up our opportunity to be able to achieve something of value.
Nothing is instant in life. Everything we want to be we must strive for first. We will not get anything without a meaningful struggle. When we fall, we must wake up and step back and move on.
As humans, we can not always have what we want to have. However, we will definitely get better if we will do our best. Doing the best is not beyond our capacity, but doing our best in accordance with our capacity. Keep fighting, then things will get better.