Es muy difícil

What is happening to my body specially my knees and hip??Actually, my body condicion have been pretty bad these days. I am in a very hard time and things I am doing are very difficult for me even I have been doing for long time that have been making me furastreted. This morning, I almost gave up and tried to escape from everthing, but finaly I did not do.

Why?? I did not want to show my weakness to Mark also I just did not want to absent from school. I went to school, however, my conditioning still have some problems. One thing that I do not want to do is make trouble theammates and Mark, so I have to be paitiant untill August (summer vacation).