When you're feeling down, and you see someone else succeeding, it's hard to open yourself up to their point of view. But that is the very thing you need. You need healthy habits. Changing your mindset (and then your behavior) is the only way to improve your situation.
I’ve certainly been on the end of being less than charitable to someone else’s success. Remember, if you choose to be negative every day, then you’re reinforcing negativity. If you choose to be positive and happy, then you’re reinforcing a happy person.
What type of person do you want to be?