The sentence "it's because..." is grammatically correct. The pronoun it refers to the preceding sentence, "I want to become a fireman". Using substitution, we get "I want to become a fireman because...". It isn't necessarily the most fluid or succinct method of writing, but it isn't wrong either.
Of course, it's important to ensure the referent for "it" is clear, as always.
I agree splitting the single thought process into two sentences seems a little unnatural. However, there are cases where it makes sense. One example is after a rhetorical question, with a full stop for dramatic effect:
Why do we take air for granted?
It's because...
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