How can I set healthy workplace boundaries without damaging my reputation or promotion prospects?

I’m 19 and I spent all my £6,000 savings that my parents saved for me from me being a baby. How do I get them to see that this wouldn't have happened if they had saved up a decent amount for me?
Why do some people do act of charity to their fellow ones and go on letting others know about it?
How do you deal with a "quarter-life crisis" and feeling uncertain about your life direction?
Is happiness a destination, a skill, or simply a temporary emotion?