The word 'happy' would lose its meaning if it were not balanced by sadness.
We live in a universe devoted to the creation, and eradication, of awareness. Augustus Waters did not die after a lengthy battle with cancer. He died after a lengthy battle with human consciousness, a victim - as you will be - of the universe's need to make and unmake all that is possible.
Whatever you do, you need courage. Whatever course you decide upon, there is always someone to tell you that you are wrong. There are always difficulties arising that tempt you to believe your critics are right. To map out a course of action and follow it to an end requires some of the same courage that a soldier needs. Peace has its victories, but it takes brave men and women to win them.
The follow your dreams thing is really important because so many people are railroaded into taking other paths by their family, their friends, people who should be supportive going, 'What are you talking about?' Even just seemingly regular career paths, but if it's not what people expect for you they kind of react funny.