Should I take it or leave it?

There are times in life when you don't know what to do, so you go in search of advice. I go through those times, A LOT. I recently went and got some advice from my mom about upcoming events that will be happening. My biggest fear is high school, I'm not worried about making friends or not knowing anything. I'm worrried about growing up and moving into a new environment. I fear that I won't get into the high school that I have chosen to go to. It causes me to be apprehensive. 

 The best advice has to do with that. My mother explained to how I don't have control of the situation, but that I have to have hope. She told me not to worry and to keep in mind that I tried my best. Her advice was, "in the world, you don't always get what you want, but pray for the best. Everything happens for a reason." I still recall what she says every time I do something and aren't sure about it.