Life is not always good, which is what I have come to realize. There is always a reason why something bad happens, and when something goes badly, lessons can always be learned from it. Nothing is perfect, so we shouldn't avoid bad things, rather; we should learn how to conquer them.
Different things interest, excite, and bring joy to people. Yes, there are common things that make most of us happy, but in general, nobody is the same in that regard. That is why not everyone on this planet does the exact same things; because not everyone enjoys doing everything the same.
At the same time, sharing passions, hobbies, and collaborating can bring joy to many people. Whether this be playing on a sports team together; or doing a collaborative project; or maybe even writing a song together, happiness is also brought out by working together.
Happiness is not the same for everyone. In other words, just because something makes someone happy, doesn't mean it will also make another person happy. In life, you must find what makes you happy.
So make sure to find out and pursue what you love to do, and never let anyone get in the way of something that you love.