"There are plenty of difficult obstacles in your path. Don't allow yourself to become one of them."
This hits the nail right on the head...
How many 'obstacles' do you bring on with anger, jealousy, obsessing, perfectionism, resentment etc.? And how many of the 'obstacles' are not your concern in the first place?
Do you jump right in, defending others and take it on as your battle? Are you so bored with your own life that you need to take on someone else's? Do you feel they can't manage their own affairs? Or, and most likely, is there something going on in your life that you don't want to look at?
Are you your own worst enemy? Do you create 'problems' where there were none to start with? Is life not big enough for you? Are you addicted to drama?
Okay, that's quite a list of questions, so let's take a look. Life will present you with a myriad of obstacles during your time here on earth. Your job is to overcome them, learn the lesson and move forward. You have a lot of work to do. That is enough to keep you busy for your lifetime. Running yourself ragged 'interfering' (taking part or intervening in an activity without invitation or necessity) in the lives of others just creates stress and tension in yours.
You are capable of managing the life you were given, that is why you have it. Frankly, what others are doing is none of your business. We each need to play our own instrument in the orchestra, or it will throw the whole production off. You are the best person to conduct your life and they are capable of conducting theirs in their own way.
Stay in your own business, let others handle theirs and don't be the obstacle that holds you back.