If you are talking to fellow students or professors, my reaction is don't. They are not professional MH people. If you rant to your adviser you will get them thinking legal responsibility. They will go into defense and your self fulfilling prophecy may be they don't listen.
Put aside temporarily your perceptions of not being treated right by some people, identify what your goal is: to get therapy? to get a diagnosis and meds? And ask to see a mental health professional.

If the people who are challenging you and questioning your need are professional Mental Health (MH) people, maybe you should look for psychological help outside the university settings to avoid the conflict of medical help and professional development.

Rant on at Psych Central all you want. Write a cool calm and collected paper to read to your adviser. It should be a minute or less. This is trying to get you the medical attention you need, not appropriate to try to identify all the wrongs in the world.

And keep coming back here to PC. We appreciate people that feel the need to seek help.