Sick of looking like a child!

I am 23 years old. A grown mature woman! But the downsides are:

I have round chubby cheeks and baby blue eyes
I am only 4'11'' so I am small!
My hair is so thin so I can't do anything with it
I wear teenager glasses. The only ones that suit me are the Bench. brand as I can pass them off as adult glasses. I cannot wear adult ones as the frames are too big for my face.

I wear make up and grown up clothes. I go to university! But at work everyone always asks me shouldn't I be 18 before I start work and I am like.. I'm 23! Then they go oh sorry I honestly thought you was only 16. That's 7 bloody years difference! Please can someone give me tips . It really gets me down because nobody takes me serious enough.

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Basically story of my life! I'm sorry to know it gets you down. I'm actually trying to get used to mine as i have not many choices around here. (in my country women are supposed to look curvy, thick and stuff like that) but i'm 21 and not any of those so i'm mostly mistaken for a 12 year old.
It's actually pretty sad.
My little sister is 16 but she's always been assumed the older one and it often irritates me esp as she kind of enjoys it & never even bothers to correct them.

I'm thinking of getting a make-over soon (in London). Hopefully that helps! I can't wait to leave this discrimination hell hole of a country!

What country is this? ☺

If you feel as though your height plays a part in people thinking you're younger than you are, you can try wearing heels?
I'm not sure if this will help, but have you considered contact lenses?

I noticed that when I wear winged eyeliner and dark lips I look more mature. Also sleek, sophisticated clothing (monochrome instead of ditzy prints) can make you look older.