I exaggerated my high school community service hours a little bit
Why did you want to exaggerate the hours you worked?
I wanted to brag about my community service in front of others.
Padding your experience working community service isn't appropriate as it is misleading and lying to others. You run the risk of ruining your reputation if people find out that you haven't worked as long as you claimed in community service. Be honest when you talk about your experiences--people will still appreciate your accomplishments.
I'm lying because I like feeling superior over other people. I don't care about their feelings.
It's still wrong to lie about your accomplishments. Try to highlight them without exaggerating the hours you worked, it might backfire.