I知 the girl with perfect skin,
Who hides the scars deep within
as said above, the second line there needs an extra syllable. I would recommend putting "from" in there, so you would get "Who hides the scars
from deep within", it just makes it flow somewhat better, as the rhythm keeps flowing.
Skin so thin and pulled over bones.
again, as mentioned above, use a comma instead of and. More rhythmic stuff
I知 a teenage drama queen,
I値l be the one in all your dreams.
I'm a teenage drama queen,
I'll throw my guts up for self esteem.
A couple of things I would suggest here.
1st, personally, I would put "I'm the one in all your dreams", simply because it seems to fit better. the repetition of I'm could help emphasise that point a bit, particularly because the poem is talking about being a drama queen, therefore wanting to be the centre of attention.
2nd, I would put "Throw
up my guts for self esteem" instead of "throw my guts up for self esteem" because it seems to shorten the line a bit, emphasising the harsh reality of the deeper meaning in the poem.
Both personal notes, of course, it totally your choice whether you use them or not