WHAT I GONNA DO IN UNIVERSITY?????

I really wonder sometimes what my life is going to be like after high school, because, I'm not very good at studying, but I'm not wandering either, besides, I want to study a lot of things, but I really don't know if I will make it, I'll see later, WHY IS LIFE SO DIFFICULT??? I MEAN, I'M THINKING ABOUT WHAT I'M GOING TO DO IN MY FUTURE AND I JUST STARTED HIGH SCHOOL!!!!