I hope the dynamic between your mentors and the students gets better. They are doing things that, at least on our team, are unacceptable. I would recommend your mentors read the FIRST documents about mentorship.
http://www.usfirst.org/uploadedFiles...ng%20Guide.pdf
And I counsel caution about a student attempting to confront the adults. Being on the team the same number of years does not even the playing field. Adult mentors and students are not peers, that leads to a different set of problems. Is there a teacher/sponsor on your team? Or is there a head mentor? Perhaps take your concerns to them and ask them to talk to the younger mentors causing you concern?
Does your team have any formal organization? Do the mentors know the roles played by the student officers, the teachers and the mentors? There is some good news in your posting - the mentors care, just maybe a little too much. It should be possible to make everyone aware of their proper role and reset the environment. Apathy or the absence of mentors would be a much worse problem!
Good Luck!