Wow, I think that was incredibly inappropriate of the mentor both to show the drawings to those guys without telling you what she was going to do, as well as to tell them that she thought you were "just jealous". I'm not sure how your school is set up but if I were you, I would complain to whoever is in charge of student support. That is an incredibly unacceptable way to handle the situation, especially knowing the student is depressed and not handling it well. Student support services should be there to support the students first, and deal with all the rest second, and I'm sorry that this mentor was so insensitive to the real issue here.

Know that I'm on your side. I know how difficult school can be, it is really not the greatest place for people with mood disorders to be sometimes. I'm not sure how old you are but are you in high school? This is going to sound a little old-hat but high school does end and your experience there won't define you, I promise. Just focus on making it through one day at a time, for now, and keep us posted on how you're doing.