Hesitation of My Life

I used to hesitated a lot, for example: things that I want to do but then because of hesitated, I willing to let it gone easily, then  I regretted afterward. However, it won't be the case for now. I willing to do more without hesitate, not even a bit. One of the fact, I already a Junior at Zaman University, Cambodia, and I was not hesitate to drop out, and come to US to restart my study as a Computer Science student. Funny enough, I attending in Normandale Community College, some people laugh at me, they found it funny in the way I made decision. However, they don't know what I had gone through at Zaman University. One of my full-time instructor know nothing about programming, and he control most of the courses I studied. He taught Software Design, I understand the course by self study, read the book, not from his explanation. When it time study operating system, he know nothing again, at this time I can't help myself by just read the book anymore because the topic is too big to do so. Therefore, I got nothing from the course. He also taught Data Structure and Algorithms in Java Programming languages, he doesn't know how to install compiler to run java and compile in the command line interface, but he came to ask me how to install. Then one of students code is not working, he supposed to identify the problem but he don't know what  is wrong, then he came to ask me, "what is wrong with the code?" I looked at it and simply saw two constructors in the same class of Java language, and I told him, "Main class of Java cannot contain two constructors." I feel more hopeless, if my instructor like this, how can I expected to learn more from him? So these are the reasons that I drop out from a Junior of University and come to a community college. I still keeping my goal, I want to get into University of Minnesota, according to Time High Education, U of M rank number 46th world wide in general, and number 38th in technology.