Black Cat: You could get away with playing B7 instead of B, but only in certain situations, such as when playing in the key of E major or E minor, and even then only sometimes. In certain other keys, it could sound terrible.
Your guitar teacher told you that a lot of guitarists do it but I hope he stopped short of recommending that you do it, just because you can't play B yet. That would be bad advice. Not only do you risk bad note clashes but it holds you back from mastering the real B, as you're not getting the chance to practise it in songs.
If an accomplished guitarist does it, it's because they prefer the sound of B7 at that point. That's a valid reason for doing it.
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