Were is used because the verb is in the subjunctive mood, indicating an unreal condition. W as is often used in place of were , but I don't consider doing so good English, and I don't recommend it. )
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AnonymousI wonder why in the lyric they use "were"Because it's after "if". After "if", was is very frequently changed to were. This indicates something imagined. Here, the singer, a woman, is imagining herself as a boy.