Yeah Becoming, I gathered that this is something that has been going on for many years for you, it's not a reaction that will happen over night, and in your case it's years of being dismissed or put to the side whilst the needs of everyone else in your family have been attended to.
I think that getting a therapist is a great idea. It will help you to begin to unpack what the root cause is and deal and address those issues in particular that have caused you to have this response.
And yes you're right - parents are often in some kind of denial that there is something wrong with their kids - they dismiss it, push it to one side - all of which buries the problem even further - because eventually at some stage, it will errupt with full force.
And it's a shame that in some cases you've had to be THAT desperate before somebody in your family opened their eyes and said to themselves woah I think you're going through a difficult time here! It didn't have to reach that stage, they should have known a lot sooner.
I can write a whole novel on society and stigma - ughhh I think that I hate it as much as you do.
As for family?
At the best of times they may mean well, maybe, but they really can do more harm than good to our overall mental health, really they can.