This weird thing happens as you get older. You stop caring about people that used to get under your skin, and you start to focus more on your own life and the things that make you genuinely happy.  You stop being fixated on other people's achievements and find yourself thinking about your own goals and your own future.  You start to realise that no one else can get you to where you want to be, but yourself.  Your late 20s is the time where everything really starts to make sense (finally).