I'm now in my fourth year of physics and taking QFT right now. I always was quite OK gradewise at my german university, had a 1 (=A) in my pre-diploma, was among the best, and thought I can do what I want to do, which is fundamental physics. Right now I'm in the USA. Every teacher I had was strongly advising that everyone, even those who want to be experimentalists, attends a QFT lecture. So no question about it for me since I'm interested in theoretical physics. But right now I can't see how anyone but the best of the best are able to succeed in such a class. Our teacher is basically covering everything in Peskin/Schroeder and I'm reading the fourth chapter right now and I don't understand a single word anymore, not to mention being able to solve the problems. When I close the book because I'm frustrated it gets even worse, because it says "Introduction" on the cover. I'm wondering if those who I look up to, my professors and teachers, ever struggled like me, since I wanted to persue an academic carreer too. But right now I am doubting if I even can achieve a PhD. In my GTR class last year there was no exam, but I seemed to do fine. I don't know if I am lacking the basics or if the Peskin/Schroeder is just not suitable, but I don't how to master this whole topic. So I'm in a little crisis right now. Maybe some of you have some advice about better books or a better technique, I don't know. Perhaps I just reached my limits, which would crush all my vague plans about the future.