(Also my english is bad sorry) 
I've been seeing this therapist for the 8th time when she diagnosed me with BPD. She told me that she couldn't do anything anymore for me, even if I told her many times that she wasn't helping me getting better. All she did was making me talk about things in my life that were making me feel bad, without giving me ANY ways to cope with them or whatever. She told me I didn't to go to a doctor.

The thing is I live in Canada okay and everything you hear about public health care is really nice and everything but, in fact, since it's free, it's really complicated to reach to my family's doctor because they have so many patients.

Also, my mom, who is paying for my therapist appointement, always told me that it was okay for her to pay for my therapy if I needed it and everything, but she always tought that I didn't have anything serious, I was just goinf through my teenage rebellion or something.
Honestly I was okay with that. After all, if I didnt have a "real" mental problem, good yknow. 

And now, I don't have a therapist anymore, my mom's gonna find out because she won't be paying anymore, and I can't figure out how to tell her that I actually have something rather serious because she won't take me seriously...
Don't know what to do.

(Also I'm 18)