It's great that you recognize this and have awareness of this...

Do you recall when and why these insecurities surfaced in your life? Were there specific life experiences that contributed to you developing these insecurities? (you don't have to speak about this publicly if you don't care to)

Your reaction to your friend's circumstances should be viewed as a 'symptom' of a deeper, underlying 'cause'... The underlying cause is the preexisting insecurity which is really just unprocessed and unresolved emotional energy from your past that has been stored within you.

The key to lessening your reaction to these present circumstances is to push yourself to shift your attention/focus away from your friend and her circumstances - and re-direct your attention/focus inwardly to yourself and to whichever earlier life experiences contributed to you developing your sensitivity & insecurity. You have to get to the cause of all this, and the cause is not your friend's current circumstances/situation - her circumstances/situation are just serving as a reminder that you have something going on within you which is still unresolved and needs to be (eventually) healed....