I would like to understand the meaning of the first part of this sentence, I
get parts but not the whole thing.

> このままだと自分だけじゃなくてこの世界壊れるだろう。

I get that この世界壊れるだろう means this world will break.

I think まま means as it is, so このまま is something like "as this is". I don't
really know about だと, I assume だ is です and と connects is to the other part of
the sentence. 自分だけ means only oneself but I'm confused about じゃなくて, is this
like じゃない but for some reason conjugated with くて at the end? How does that
change the meaning of じゃない?

I think it means something like "as this is the world will break" but I don't
really know how と自分だけじゃなくて works here.
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translation conjugations song-lyrics
このままだと自分だけじゃなくてこの世界壊れるだろう
I believe either が or も is missing after 世界. If you're sure you've copied this
sentence correctly, perhaps it's a simple typo in the original text.

> このままだと自分だけじゃなくてこの世界 **も** 壊れるだろう。  
>  If this goes on, not only me but also this world will break.

  * **このままだと** : "If this goes on...", "At this rate...", "If nothing is done..." 
    * このまま: "the same state as this/now". See [this](https://japanese.stackexchange.com/a/48381/5010).
    * だ: "is" (copula)
    * と: conditional と. "when", "if". See [this](http://www.guidetojapanese.org/learn/grammar/conditionals).
  * **自分だけ** : "only me"
  * **AじゃなくてB** ≒ AではなくてB: "not A but B" 
    * じゃ is colloquialism for では.
    * なくて is the te-form of ない. You can also use the ku-form (なく) here.
  * **AだけじゃなくてB** ≒ AだけではなくてB ≒ AだけでなくB: "not only A but also B". See [this](http://japanesetest4you.com/flashcard/learn-jlpt-n2-grammar-%E3%81%A0%E3%81%91%E3%81%A7%E3%81%AA%E3%81%8F-dake-de-naku/) and [this](https://japanese.stackexchange.com/q/8280/5010).
  * **も** : "also"
  * **壊れるだろう** : "... will break". Note that 壊れる is an intransitive verb and never takes を. The transitive version is 壊す.

So let's get used to this "not (only) A but (also) B" pattern, which is very
useful and important!
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answer
You are really close, so lets try to break it down for you.

Here's your sentence:

> このままだと自分だけじゃなくてこの世界壊れるだろう。

I'm going to break it down from left to right.

**このままだと:** このまま translates to `in this state,` so good job on the translation
here. だ is the plain form です、so you're correct here. The と、however, is where
our translations will differ. This と is actually translated to `if,` ([see
this link](http://www.guidetojapanese.org/learn/grammar/conditionals)) so this
phrase translates to something to the effect of `if this is the current
state.`

**自分だけじゃなくて:** The main grammar here is found at the end, `じゃなくて.` You're
right to say that this is a conjugation of じゃない. When ending a verb (to be in
this case) with a 〜て, you give the impression that there is more to the
sentence. For sake of simplicity, lets just describe this as an compound
particle (and/but in particular). Really, you're creating a compound sentence.
([see this link](http://www.guidetojapanese.org/learn/grammar/compound)) This
phrase will be something to the effect of `not just me, but`

**世界も壊れるだろう:** (notice the addition of も) This is as you translated, so I
won't beat a dead horse. `The whole would would break also.` The also in this
sentence comes from も。

So, lets translate the sentence as a whole.

> If this is the current state, not just me, but the whole world will break
> also.

(I realize @Naruto already posted a great answer, but I figured I'd finish my
answer anyway since I was already really close.)
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answer