Nikon FM2 - problem?

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I recently purchased a Nikon FM2 and was really looking forward to getting into film photography. However, my photos appear to be blank / partially exposed. For example, some look fine, others are totally blank. I've checked elsewhere online and people have suggested to look for the text printed on the film to see if the developers are destroying the film – the text is there and looks as it should. So, I'm starting to think it's either me (incorrect exposure / metering / loading of the film), or the camera isn't working properly. I've uploaded a few examples from my most recent roll.

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