[JP] struggling with the correct translation

[i0wntehworld]

basically im having trouble with these sentence here

私のフリして私のファンを誘惑して。。。
pretending to be me and seducing my fans...
このままで済むと思ったの。。。？
This little nonsense ends here...
偽物が。。。
an imposter...
本偽にかなう。わけない。じゃない
there is no reason for an imposter like you should exist
でも心配しないで？
but do not worry
二度と私のフリが。出来ないよう。グチャグチャに。してあげる。
???
*the words in red are the ones im unsure of.
*i can't really translate that last sentence.
*also, its the same person talking throughout (i believe).

can someone help me understand what's going on in this conversation?

[Masa Kaneda]

I'm not an experienced translator, but I hope this will help you.

このままで済むと思ったの。。。？
This little nonsense ends here...

"Do you think this ends now?"

本偽にかなう。わけない。じゃない
there is no reason for an imposter like you should exist

I think you mean 本物.
　coz 本偽 doesn't make sense.

"There's no way you can defeat the real person. "

二度と私のフリが。出来ないよう。グチャグチャに。してあげる。
???

"I'll fuck you up beyond repair to make sure you can never pretend to be me."

[noutenki]

このままで済むと思ったの。。。？
This little nonsense ends here...

That's actually a good translation. Literally, the sentence means "Did you think it would just go on like this and end?", so the speaker is saying she won't let impostors copy her with impunity. The only problem with your translation is, that it misses the implied punishment, so maybe something like "Did you think you'd get away with this!?"


偽物が。。。
an imposter...
本偽にかなう。わけない。じゃない

本物にかなう means "be a match for the real thing". わけ can be a bit difficult to translate. The dictionary says "reason, cause, circumstances", but the literal translation is usually wrong. わけ is often used to make a general statement or state a principle, and in this case the principle is, that fakes are no match for the real thing. じゃない is NOT a real negation. It's similar to "is it / isn't it?" at the end of a sentence in English, e.g. いいじゃない = that's good, isn't it?
"A fake's never beats the real thing, right?"

でも心配しないで？

"But don't you worry!" (about not standing comparison to the real thing)

二度と私のフリが。出来ないよう。グチャグチャに。してあげる。

I like Masa's t/l. Here's a shorter one, since space is usually limited: "I'll mess you up so you can never imitate me again.

[i0wntehworld]

there are no words to express my gratitude toward you both... thank you for your help
i was stuck on this for quite sometime, thinking of ways on how it should make sense in english... i can now start moving forward...(although there still will be more to come).
any advice on improving my mediocre translation skills?