Celine, this is a dark piece full of imagery and somewhat sadness behind the whole of it.
I have a few suggestions if that's ok?

Can compare to an angel
but worst like a demon from hell.
Just hiding inside
in this innocent facade
^^
On the outside I could compare to an angel
but inside reaching out is a demon from hell
just creeping out of my innocent facade.

Oppressed emotion of mine
Burst like a flaming flare
Dazzle through the air
Causing such a lot of pain.
^^
Bursts out like a flaming flare

Blame me not!
For being like this.
for it is not my fault.
to become a beast.
^^
I become a beast.
Remember they are only suggestions. All in all a good write. Em

Oh I really liked this poem!! I thoroughly enjoyed your phrasing and the contents is very relatable. Wonderful. Regards Ink.