I hate the sterotype of that just because you're a teenager it must just be a phase of some sort.

I've been mentally unstable all my life, and many have said "oh it's just a phase" "oh it's being a teenager", ha, I won't mention just how severe I've gotten, but that is NOT a phase, I am ill to this day & I will be for the rest of my life, and mental health illnesses are actually more common in children than people think, they are just ignored & down played & written off as "phases".