Life is made up of little things.
"I'm a Martian, ain't no stars in my eyes."
No matter what happens in life, be good to people. Being good to people is a wonderful legacy to leave behind.
You may not be able to alter reality, but you can alter your attitude towards it, and this, paradoxically, alters reality.
You have to be willing to make mistakes; the big thing is to not make the same mistake over and over again.