Have you tried what is in this post?
http://talk.collegeconfidential.com/college-life/1920853-college-is-a-step-up-from-hs-16-tips-on-doing-well-in-college.html
Professors can be somewhat patient, but they have to 1) Teach you a certain amount of material 2) In a certain amount of time 3) And see if you have mastered that material
I would go to the counseling center at your school. Maybe you should be evaluated for anxiety?
Maybe this isn’t the right major for you?
Maybe you need tutors and to go to professor office hours and to get a study group together.