No! Do not fall for the cancerous ideology that is hedonism. Living your life to maximize pleasure at any and all expense is a lazy and unfulfilling way to spend your life. Pursue a direction in life, preferably one that is just and beneficial, set and focus on your individual goals in life.
If your dream is to become an astronaut, set your sights incrementally to achievable goals: do well in school, get into a college, get a STEM degree, keep in shape, become a military aviator, get a fighter slot, apply for the test pilot school, apply for an astronaut candidate slot, jump through the hoops, and bam! You're there. Each one is an individual accomplishment and should be pursued and celebrated as such. If you don't get it, keep going in a similar direction.
You cannot sit and think of the bad aspects of humanity or the cold nature of life in general. Focus on you, on your own personal wellbeing and success. That is how you can contribute to better your society, not by trying to move mountains. It's an individual endeavor that has a collective beneficial effect. By doing so you remove yourself as a cog in the machine and improve your life, which in turn can inspire and improve other's.