seriously guys....seriously

I am accustomed to people taking me seriously. I am intelligent. I'm not a genius or anything, but I know that I'm a smart person and for pretty much my entire life, my grades reflected such and my teachers, etc, took me seriously. Suddenly that has stopped. I got an email from someone I deeply respect today and it was obvious that they didn't think I could handle a certain class. I cannot explain how devastating that was to me. He doesn't take me seriously, and it's my own fault. I have done this. I have completely thrown away my grades, and for what? Nothing important that's for sure. Well it is not going to continue. I guess that I thought people should just know who and what I am by knowing me instead of looking at my grades, and in a way I still strongly hold to that belief. However, I am not that person who gives less than everything to school. I'm the girl that studies her heart and soul out because she loves to learn and strives to be great at what she does. Somewhere along the road I cynically threw that girl aside. Now I only hope she'll forgive my stupidity and help me prove to everyone that they are sorely mistaken about exactly what I am made of.