Norman Vincent Peale is the man that everyone can thank (or blame) for the popularity and proliferation of self-help books everywhere. With his 1952 work "The Power of Positive Thinking," Peale changed lives everywhere by enforcing one simple notion: positivity is key to maintaing happiness.
I think in general, people can agree with this sentiment. On a surface level, it seems simple that maintaining a positive outlook is a beneficial attitude to have. Yet, how many people really take this concept to heart? I'm willing to wager that it's lower than 50%. It can be hard to maintain a cheery disposition, especially as a young person who's getting started in the world. It seems that the odds are always stacked against you. And maybe they are- but it shouldn't stop you from trying your hardest to maintain that positivity.
I learned this lesson through trial by fire. for a few months now, I've worked as a canvasser, raising money on the streets of New York. This can be a particularly trying position to be in. The numbers tell you that 1 in 20 people will stop, and of those, 1 in 10 will donate. Generally speaking, you can expect 85% of people to give you various different 'nos'. This can easily wear on you, body and soul, if you let it. The most important thing to remember is to keep positive about everything happening to you. Even the physical act of smiling can raise your serotonin levels, actually making you happier.
I'm not saying that it doesn't sometimes get to me, because it definitely does some days. What i'm saying is that you need to push through the negativity and get back to that positive place, because that is the font of basic happiness.