Movie is called DEATHGASM . Look it up, you won't regret it

Hmmmm

She wears short skirts, I wear T-shirts

Literally me and my bf. Except I'm the goth one and he wears colorful athleisure type clothing.

Same, except it's not me and someone else, it's me and myself like, 10 minutes later
Sometimes I'll be sitting in my rainbow pastel thigh highs, bright red skirt and striped arm warmers feeling happy, and other times I'll be dressed almost all in black, browsing the internet for knives.
.
My mom doesn't think I have a personality disorder, but she does think that my personality drastically changes from one moment to the next. I'm inclined to agree.