Reinhold Niebuhr said: "God, grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference."
I don't think God has anything to do with it, it's something you have to figure out for yourself. If something isn't as you'd like, try to change it. Don't do it with anger, frustration or out of desperation. Do it with love and peace, and hope for a better tomorrow. And if you find out that this thing cannot be changed, find the strength to accept that it cannot be changed. Now you have a decision to make: do you want to keep it in your life or do you want it out? Because change is always possible, even when it's not.
I cannot tell you how many times I've tried to make a change. I have succeeded and I have failed. But in all cases, change was made. Sometimes not as I had hoped, but something always comes out of it. Even if it only made me see things clearer. Sometimes a little clarity is you need.
I don't mind aiming for the stars, but I always keep my feet on the ground.