I got put in "the dumb group"

Today in my calculus class, we were divided up into groups. The teacher told us that the groups were assigned based on brain level. She wouldn't put the dumbest person with the smartest. Anyway, I was put with the two dumbest people in the class. I was humiliated by my teacher. I value intelligence and above all, it's what I desire. I'd like to think I'm smart, but I know I'm not. My mind works too slow. In my other classes, my friend finished a test in literally half the time I did. He got a 98 and I got an 88. My mind is just too slow. I just imagine myself with my tongue sticking out and my eyes crossed because I'm so damn stupid. I'm extremely depressed and suicidal with this situation alone. I won't accept when people say I'm smart. I'm being illogical, but others are way smarter. No matter how smart I were to be, I would always feel stupid because someone would be smarter. I realize intelligence cannot be truly measured, but we all know some people are genuinely better. Help? I want to die because my brain isn't very fast.

Actually you are way ahead of the game: you recognize that there are those smarter than you. Many people never figure that our. It is actually an advantage to see that.

I suggest you ask the teacher to either help you after class or find a tutor. You can always buy the instructors edition of your textbook and work thru all the problems until they make sense.

If your teacher used the term "brain level" then your teacher is the dumb one. I've had several years of college and I can tell you that pretty much all of my professors who seem really intelligent in their field would seem like a moron in another study, and they will tell you this themselves. So fortunately for us we live in a society that values specialization.

Do I assume correctly that this is high school? High school is nothing more than a training course for college in most cases and certainly not a good measure of intelligence. I went through high school and some of college thinking I was dumb as hell but once I found my niche in computer programming I felt like a genius.

You can't beat yourself up for making a B+ on a test, that is already better than average. While you may feel less than par in your country you are ahead of the curve when you look at the world as a whole.