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Please read the following:
How Do I Get Him/Her to Orgasm From a Hand/Blow Job?
The fella is new to all this so, yes, you could say he has stage fright, although we generally term it Performance Anxiety. He is no doubt worrying about all sorts of things real and imagined and these will often prevent a guy from performing.
Second to this is in learning how to stimulate a penis. You can get a guy to ejaculate by the sheer power of arousal, although, in this situation, he was probably over stimulated, beyond what is required (by him) to trigger an orgasm. Better to use your hand in conjunction with your lips/mouth, and when he has some confidence, get him to show you how to stroke his penis in order to mimic what he does. A b/j in conjunction w/a h/j will pretty much guarantee a climax.
Third, is in giving each other feedback (verbal and/or non-verbal) on how each of you is responding to the other's caresses and for what you need now/next.
After reading the article, please do not hesitate to ask questions.