i know some Nepali people who are going to school in their 30s and still pursuing a career. dude, .this is America , people change their major and career all the time because of the job market and interest. people live here till 100s and you see 70 yr old ppl still working, so think this way, 30s here is 20s and 40s here is 30s.. don't think you're old at at.. lot of times it may not even you, but those goofy old 10 yr professors who think they are einstein stuck in a college middle of nowhere. try to talk to friends and find out if the professor is a reasonalbe before you sign up the class. some of these whackos have their own style, say some like to ask by books, and some only ask what they teach you on the lecture while some do both. try to understand their style. if you're doing your best and other ppl are having hard time to in the department, dont even hesitate to change schools. there are lots of schools and departments run by ppl ppl with attitude and intentions which is not necessarly to teach. I had a professor once who hated indians and south asian in over, i heard that he even went as far as saying you indians come here to steal jobs with exgagerrated resumes some indian students. He gave me a b - although i deserved a+, i went to dept head and all that but to no avail, later i found out he has become the dept head in that school. so don't just blame on you and try to find solutions ,often that may lead to change your major, job ,or even school. don't let your future get ruined by some stubborns fools who have degrees from like 30 yrs ago.