Given the data you provided, it seems likely that you are experiencing adolescent premature ejaculation, which is found often in adolescents and is not considered pathological. The lack of sexual intercourse may cause increased sensitivity in the genital area as well as increased nerve stimulation. This can explain the fact that you experience and erection and ejaculation happens while you are having sexual thoughts.
Regular or frequent masturbation might be a good solution in this case in order to get relief and prevent spontaneous erections. If this suggestion does not help, you might want to use “the start-stop technique” during masturbation, as described below:
1. The man is encouraged to masturbate alone.
2. He is asked to set time aside, to be private.
3. The man is encouraged to masturbate ALMOST to the point of ejaculation and then stop.
4. He should do this three times.
5. On the fourth time, he is permitted to ejaculate.
If this technique does not help, you might want to consult a sex-therapist.
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