Don't worry.: Since arousal is largely psychological, you may be responding to life stress or lowering your libido by worrying about it. Try stress reduction techniques, and pay less attention to the strength of your erection for a while. At 21 years old, your libido will likely return to your previous state. As an experiment, try skipping a day of masturbation and see if your erection returns.
Answered 11/28/2017
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